which is the most primitive of the robust australopithecines?
Answers
Answer:
Robust australopithecines are conventionally sorted into
three species: a single species from South Africa, Australopithecus robustus [1.8 to 1.5 million years ago (Ma)] (1), and in East Africa, A. aethiopicus (2.7 to 2.3 Ma) and A. boisei (2.3 to 1.3 Ma) (2).
Related Questions
how do the 4 spheres interact with each other
Answers
Answer: ENERGY AND MATTER MOVE between the land, water, atmosphere, and biosphere — between the four spheres. In addition to natural interactions, human activities, such as the clearing of rain forests, can affect interactions between the spheres.
Explanation:
Pick one of these critical scarce resources:
• Phosphorus
• Scandium
• terbium
- Provide 3 reasons why this resource is so critical along with
what the resource is primarily used for.
- As the availability of the resource decreases, what would
you expect to happen to the price of the resource and
how will that impact the demand for the resource, and the costs of production of products that rely on that resource?
- Explain 3 ways the national economy would be impacted
by decreased availability of this resource.
- Explain 3 things American companies should do to
minimize the negative economic impacts of declining
availability of the resource.
- Explain 3 things the Federal government should do to
support the economy as this resource declines in
availability.
Answers
Let's focus on Phosphorus as the critical scarce resource. Here are the answers to your questions:
Reasons for Criticality and Primary Use of Phosphorus:
a. Essential Nutrient: Phosphorus is an essential nutrient for plant growth. It plays a crucial role in processes like photosynthesis, energy transfer, and DNA synthesis. Without phosphorus, plants cannot develop properly, impacting agricultural productivity.
b. Limited Reserves: Phosphorus reserves are finite and concentrated in a few countries. The scarcity arises from limited availability and geopolitical factors, making it critical for long-term sustainability.
c. Multiple Applications: Phosphorus is primarily used in fertilizers to enhance soil fertility and crop yields. It is also utilized in animal feed additives, detergents, food preservatives, and various industrial applications.
Impact of Decreased Availability on Price, Demand, and Production Costs:
As the availability of phosphorus decreases:
a. Price Increase: The price of phosphorus would likely rise due to supply-demand imbalances. Limited supply in the face of consistent or growing demand would drive up prices.
b. Demand Impact: Higher prices may lead to reduced demand for phosphorus-dependent products, especially in agriculture. Farmers might reduce fertilizer usage or seek alternatives, affecting the demand for phosphorus.
c. Production Costs: Industries relying on phosphorus would experience increased production costs due to higher input costs. This includes agricultural production, leading to potentially higher food prices, and other sectors dependent on phosphorus-based products.
Impact on National Economy:
Decreased availability of phosphorus can impact the national economy in several ways:
a. Agricultural Productivity: A decline in phosphorus availability would hamper agricultural productivity, leading to lower crop yields and potentially affecting food security.
b. Economic Sectors: Industries relying heavily on phosphorus, such as agriculture, food processing, and chemical manufacturing, may face challenges. The increased costs could impact their competitiveness and profitability.
c. International Trade: Countries heavily reliant on phosphorus imports might face trade imbalances and vulnerability in global markets. Dependence on a scarce resource increases the risk of supply disruptions and trade disputes.
Actions for American Companies:
American companies can minimize negative economic impacts by:
a. Resource Efficiency: Implementing technologies and practices that maximize the efficient use of phosphorus, such as precision agriculture and nutrient recycling systems.
b. Diversification of Inputs: Investing in research and development to identify and adopt alternative nutrient sources or develop phosphorus-efficient crop varieties.
c. International Cooperation: Collaborating with international partners to explore sustainable phosphorus management strategies, including recycling and responsible mining practices.
Actions for the Federal Government:
The Federal government can support the economy in the face of declining phosphorus availability by:
a. Research and Development: Investing in R&D initiatives to explore alternatives to phosphorus-based fertilizers, improve phosphorus recovery from waste streams, and promote sustainable agricultural practices.
b. Policy Measures: Implementing policies that incentivize phosphorus recycling, sustainable land management, and efficient fertilizer use. This can be done through regulations, tax incentives, or subsidies.
c. International Engagement: Engaging in global partnerships and collaborations to address phosphorus scarcity collectively, advocating for responsible mining practices, and ensuring fair trade in phosphorus-related products.
These actions aim to reduce dependence on phosphorus, promote resource efficiency, and stimulate innovation to mitigate the economic impacts of its declining availability.
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classify each of the following as an element, compound, homogeneous mixture, or heterogeneous mixture. 1.water
2.Caesar Salad
3.milk and cereal
4.Iron filings
5.blood
6.sugar
7.sand
8.sea water
9.salt
10.carbon dioxide
Answers
Caesar Salad, milk and cereal, Blood, Sand are heterogeneous mixture while water, sugar and salt are compounds and Iron filings is a element and Sea water is a homogeneous mixture
A pure substance with only one kind of atom makes up an element. The elements oxygen, hydrogen, and iron are examples.
A compound is a substance that is composed of two or more distinct elements that have been chemically bonded together in a specific proportion. Examples include sodium chloride, carbon dioxide, and water.
A combination of two or more substances that are evenly distributed at the molecular level is referred to as a homogeneous mixture. The mixture's composition is constant throughout. Examples include air, sugar water solutions, and saltwater.
A combination of two or more substances that are not distributed equally is referred to as a heterogeneous mixture. Visual differentiation between the various elements is possible and with time, they may settle or separate. A salad with various ingredients, soil and vinegar dressing are some examples.
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During which process is oxygen gas released into the atmosphere?
Answers
Answer:
photolysis
Explanation:
it happens when the uv radiaiton of sunlight breaks apart the oxygen containg molecules.
What is a mechanical wave give an example
Answers
One example of a mechanical wave is a sound wave. When you speak or make a noise, you create sound waves that travel through the air. The sound waves cause the air particles to vibrate, which in turn causes the sound to be heard by someone nearby.
Another example is a water wave. When you throw a stone into a pond, it creates ripples that travel outward through the water. The ripples are a type of mechanical wave, because they need the water to move through.
Overall, mechanical waves are important because they allow energy to be transferred from one place to another, even over long distances!
Classify each feature as describing euchromatin, heterochromatin, or both.1. has a high level of transcription2. is the major state of human Y chromosome3. is found in prokaryotes.4. is the major state of most genes.5. is astate of DNA organization.6. is loosely packed.7. has a low level of transcription.8. is tightly packed.euchromatin =_______both = _______heterochomatin =_________
Answers
1. euchromatin: has a high level of transcription 2. heterochromatin: is the major state of human Y chromosome 3. both: is found in prokaryotes 4. euchromatin: is the major state of most genes 5. both: is a state of DNA organization6. euchromatin: is loosely packed7. euchromatin: has a low level of transcription8. heterochromatin: is tightly packed.
Euchromatin is the less condensed form of chromatin that is present in the interphase of the cell cycle. Euchromatin contains most of the genes that are required for the growth and development of an organism. It is known to be actively transcribed during the cell cycle, meaning that transcription factors can easily access DNA to bind and express genes.
As a result, euchromatin is known to have a high level of transcription.Heterochromatin is the more condensed form of chromatin, which is inactive during the cell cycle. It appears as darkly stained regions of chromosomes and is usually found near the centromere and telomere regions.
The genes present in heterochromatin are tightly packed and are usually not actively transcribed. Hence, heterochromatin has a low level of transcription.
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Select the correct answer.
In a car accident investigation, forensic Investigators could not locate the antemortem dental record of the victim for comparative study.
What should they do to Increase the probability of locating the antemortem record?
A. perform comparative dental identification
B. perform dental profiling of the victim
C. look for other evidence
D. scan the global databases
Reset Next
Answers
Answer:
the answer is b
Explanation:
Drag the tiles to the correct boxes to complete the pairs. Match the medications with their effects. suppresses or blocks the cough reflex stimulates vasoconstriction of blood vessels relaxes and dilates the bronchial muscles Bronchodilator arrowRight Antitussive arrowRight Decongestant arrowRight
Answers
Explanation:
Can you reformulate the question? There's no one can understand that....no punctuation marks,no nothing
Answer:
bronchodilators - relaxes and dilates the bronchial muscles
antitussive - supresses the cough refex
decongestant - stimulates vasoconstriction of blood vessels
Explanation:
PLATO
(05.01 MC)
brainliest!
Which of the following is most likely to happen if the cell membrane does not function properly? (5 points)
The cell will not be able to store waste.
The cell will not be able to eliminate waste.
The cell will absorb oxygen during photosynthesis.
The cell will absorb carbon dioxide during respiration.
Answers
Answer:
it should be B
Explanation:
because if the cell membrane does not function properly it allows abnormal movement of substance in and out of the cell membrane.
Which three steps describe how an animal obtains and uses energy for growth?
First, an animal eats another organism. Then, food is built into larger molecules. Next, the animal’s cells use molecules to make new cells.
First, food is built into larger molecules. Then, the animal eats another organism. Next, the animal’s cells use molecules to make new cells.
First, an animal eats another organism. Then, food is broken down into smaller molecules. Next, the animal’s cells use molecules to make new cells.
First, food is broken down into smaller molecules. Then, the animal eats another organism. Next, the animal’s cells use molecules to make new cells.
Answers
Answer:
3
Explanation:
First, an animal eats another organism. Then, food is broken down into smaller molecules. Next, the animal’s cells use molecules to make new cells.
the animal has to first eat the other organism, when food is ingested it is broken down into smaller molecules. Amylase breaks down complex sugars to glucose, protease breaks down protein
can hamsters eat dragon seeds?
Answers
Answer:
please mark as brains list
Explanation:
No hamsters can not eat dragon fruit because the seeds will choke them and also it has toxic things that hamsters can not eat, but only humans can, but here are the list of fruits they can eat.
Apple (seedless)
Banana
Blackberries
Blueberries
Cantaloupe.
Cherries
Cranberries
WILL GIVE BRAINLIEST!!!!!!!!
The egg in the Hawaiian punch turned blue. Assume the inside of the egg is blue too. By what process did the dye enter the egg?
Active transport
Osmosis
Diffusion
Endocytosis
Answers
Answer:
Active transport
Explanation:
How many chromosomes does a child inherit from his or her parents?
023 from the mother and 23 from the father
0 46 from the mother
O 46 from the father
46 from the mother and 46 from the father
Answers
Answer:
A. 23 from the mother and 23 from the father.
Explanation:
People have 46 chromosomes. You get 23 from each parent.
Hope it helps!
Answer: 23 from each parent
Explanation: EDGE 2020
What are the characteristics of stratified squamous epithelium?
Answers
Squamous epithelium is a type of tissue that lines the surface of many organs in the body. The characteristics of stratified squamous epithelium are : it is composed of multiple layers of cells, it is keratinized
Stratified squamous epithelium is a type of squamous epithelium that is made up of multiple layers of cells.
One of the main characteristics of stratified squamous epithelium is that it is composed of multiple layers of cells. The top layer, also known as the surface or squamous layer, is made up of flat, scale-like cells called squamous cells. These cells are tightly packed together and provide a barrier against physical trauma, infection and desiccation. The bottom layers are cuboidal or columnar cells and are responsible for cell proliferation and differentiation.
Another characteristic of stratified squamous epithelium is that it is keratinized. This means that the cells in the surface layer contain a protein called keratin, which helps to protect the surface from damage and dehydration.
Stratified squamous epithelium is found in many parts of the body, including the skin, oral cavity, esophagus, and vagina. It is also found in the surface of certain internal organs like the bladder, where it is known as transitional epithelium.
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A severe fever can result in death if not brought under control becauseA) it may destroy the primary structure of cellular enzymes.B) it may alter the tertiary structure of cellular enzymes.C) it may increase the rate of cellular chemical reactions.D) it may result in binding inappropriate substrates by cellular enzymes.
Answers
Answer:
B) It may alter the tertiary structure of cellular enzymes.
Explanation:
A severe fever can be harmful to the body because the high temperature can cause the denaturation of proteins, including enzymes. Enzymes are biological catalysts that facilitate chemical reactions in the body by lowering the activation energy required for the reaction to occur. Enzymes have a specific three-dimensional structure that is essential for their function. However, high temperatures can cause the bonds that maintain this three-dimensional structure to break, causing the enzyme to denature and lose its catalytic activity.
Therefore, a severe fever can be dangerous because it can cause the denaturation of enzymes, leading to the disruption of metabolic processes and potentially causing irreversible damage to vital organs. If left untreated, a severe fever can result in death due to the alteration of the tertiary structure of cellular enzymes.
Discussion
For this lab report, you will be discussing the results shown in the data table from the previous page. Some of the questions
you should address in the discusssion include the following:
1. What were the independent variable and dependent variable in this experiment? In this experiment, what is being
altered for each trial and what is being recorded for the results.
2. Explain why counting the number of oxygen bubbles produced is an acceptable method to determine the rate of
photosynthesis. What is the connection between the oxygen bubbles and photosynthesis?
3. Why do white and green light colors cause different rates of photosynthesis?
4. Explain any possible sources of error in the experiment.
Answers
Elodea exposure time is a constant that is unaffected by the distance from the light source, the rate of photosynthesis, or the dependent variable.
What was the dependent variable in the Elodea experiment?The duration the elodea is exposed to the light is a constant and is independent of the elodea's proximity to the light source, the rate of photosynthesis, and the dependent variable.
the cause is the independent variable. The other factors in your study have no bearing on its value. The outcome is the dependent variable. Changes in the independent variable affect how much it is worth.
How many bubbles emerged while the light source was on was the dependent variable, which represented the rate of photosynthesis. Depending on the amount of light, photosynthesis will change.
Light intensity is a standalone variable (how close the light is). The number of oxygen bubbles released is the dependent variable (the rate of photosynthesis).
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As the puck falls, the amount of potential energy it has decreases. Why?
a. It is lost to the air friction
b. It is released as sound energy
c. It is changed into kinetic energy
d. It is stored in the puck
Answers
Answer:
c
Explanation:
6. Mrs. Amina was planning to make a vegetable garden. She collected seeds of tomato, lady finger, beans, pea, bringal, and bitter gourd. But she did not get the seeds of potato, ginger, onion, carrot and beetroot. What should she do for planting
Subject : Science
Answers
Mrs. Amina should plant potato, ginger, onion, carrot and beetroot from their vegetative part if seeds are not available.
What should she do for planting?She should plant potato, ginger, onion, carrot and beetroot not from seed but from its vegetative part such as stem. These vegetables can also be grown from their vegetative parts. So she should plant these vegetables from their vegetative parts if the seeds are not available.
So we can conclude that Mrs. Amina should plant potato, ginger, onion, carrot and beetroot from their vegetative part if seeds are not available.
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Bicarbonate is an important buffer in blood and its concentration is regulated by the
A) heart.
B) lungs.
C) liver.
D) kidneys.
E) pancreas.
Answers
Bicarbonate is an important buffer in blood and its concentration is regulated by the kidneys.
The bicarbonate buffer system is indeed an acid-base homeostatic mechanism that involves the balance of carbonic acid, bicarbonate ion, and carbon dioxide to support proper metabolic function in the blood as well as duodenum, among other tissues.
The most important buffer for maintaining blood pH homeostasis is indeed the Carbonic Acid-Bicarbonate buffer system. Carbonic acid is formed in this system when gaseous metabolic end carbon dioxide reacts to water to produce carbonic acid, that also rapidly dissociates into the a hydrogen ion as well as bicarbonate.
This same bicarbonate buffer system inside the human duodenum and the stomach serves to neutralize gastric acid while also stabilizing the intracellular ionic strength of epithelial cells through the secretion of carbonic acid into the gastric mucosa.
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is there more variation at the dna level or the protein sequence level when comparing related organisms?
Answers
As a result, two creatures that are distantly related may differ greatly in their DNA sequence, but differ less in their amino acid sequence, making it easier to compare them at this level.
What distinguishes DNA sequences from protein sequences?The primary distinction between the sequences of DNA and proteins is that the former is made up of a series of deoxyribonucleotides joined together by phosphodiester bonds, whilst the latter is made up of a series of amino acids joined together by peptide bonds.
Alignments are often more accurate when based on amino acids rather than their corresponding nucleotides since protein-coding DNA sequences develop as triplets of nucleotides (codons) and it is known that sequence similarity degrades more quickly at the DNA level than at the amino acid level.
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Which of the following is NOT true of nucleoid-associated proteins (NAPs)? A. Assist in the organization and packaging of the chromosome B. Found in the nucleoid C. Function similar to histones D. Interact with prokaryotic DNA E. All of the above are true
Answers
The option that is NOT true of nucleoid-associated proteins (NAPs) is E. All of the above are true. Nucleoid-associated proteins (NAPs) are bacterial DNA-binding proteins that function similarly to histones by compacting DNA.
The nucleoid is a region in a bacterial cell that contains DNA molecules that aren't enclosed in a nuclear membrane. NAPs are found in the nucleoid and help in the organization and packaging of the chromosome. Nucleoid-associated proteins (NAPs) interact with prokaryotic DNA but they do not function similar to histones. Therefore, the correct answer is option E. All of the above are true, which is incorrect since Nucleoid-associated proteins (NAPs) do not function in the same way as histones.
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Which of the following answers is NOT correct with regard to convection currents?
A. Convection currents in magma drive plate tectonics.
B.Convection currents in magma are a result of density differences.
C. Convection currents play a role in the movement of Earth’s inner core.
D. Convection currents in magma are caused by temperature differences.
Answers
Answer: C....Convection currents play a role in the movement of Earth’s inner core
The statement which is not correct with regard to convection currents is as follows:
Convection currents play a role in the movement of Earth’s inner core.Thus, the correct option for this question is C.
What is Convection current?Convection current may be defined as a procedure that significantly involves the movement of energy from one place to another. It is basically the existence of current in a fluid through convection.
The inner core of the earth has appeared as solid as compared to other parts like the crust and mantle. Most liquid particles are definitely found on the mantle of the earth's surface.
Due to the presence of excessive liquid particles and compounds, the convection current is significantly noticed there.
Apart from this, magma is also a fluid that derives current through convection. It produces in a number of ways like magma driving plate tectonics, density differences in the magma, and temperature differences.
Convection currents are basically the movement of fluid with respect to temperature or density difference within the material.
Therefore, the correct option for this question is C.
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Have you ever experienced severe weather? Severe weather comes in many forms. Tornados, hurricanes, floods, droughts, or snowstorms are just a few types of severe weather. Think about a time when you experienced severe weather. Did you know it was coming? How did you prepare? Write about your experience
Answers
Explanation:
I had two times when Tornados decided to strike the Blue River Valley in virginia. I am only gonna talk about the time when I saw the Tornado watch on WDBJ 7 Weather app on my Ipad. What happened was that me and my grandmother was preparing to Camp out in the basement bedroom we have. When we did, We just passed the time by playing games and the Deal or No Deal Deal wheel home game I had at that time.
the processes of deletion, insertion, and substitution can alter genes in a skin cell. the altered genes will most likely be passed on to
Answers
Deletion, insertion, and substitution can alter genes in a skin cell, the altered genes will most likely be passed on to the next generation
The process of altering genes can happen due to deletion, insertion, and substitution. When any of these processes occur, it results in changes in the DNA sequence of the gene. The deletion process occurs when a certain nucleotide or a sequence of nucleotides is removed from the DNA strand, while insertion occurs when new nucleotides are added to the DNA sequence. Substitution, on the other hand, is the replacement of one nucleotide with another, and it can cause missense, nonsense, or silent mutations in the DNA sequence.
As a result of any of these processes, there may be alterations in the gene's function, leading to various consequences. The altered genes may then be passed on to the next generation through genetic transmission. This may result in inherited disorders or may have no noticeable effect on the offspring, depending on the type of gene involved. So therefore deletion, insertion, and substitution can alter genes in a skin cell, the altered genes will most likely be passed on to the next generation.
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Why are they called frameshift mutation?
Answers
They are called frameshift mutations because these mutations result in a protein that doesn't make sense.
Mutations are changes in genetic material both at the gene and chromosome levels during DNA replication that can be passed on to offspring. Several types of mutations that occur in chromosomes, namely mutations that occur due to deleted and wasted chromosomes or are called deletions. While mutations due to the addition of nucleotides to the chromosome chain are called insertions.
Frameshift mutations occur due to the insertion or deletion of one or more new nucleotide bases. This causes a change in the nucleotide base sequence resulting in a nonsensical protein. This is cause each mRNA will be read out of the reading frame after the addition or insertion of a nucleotide base.
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Dimensional analysis
Explain and justify your
process
1. [30 marks] Grizzly bears are an important species in the Yellowstone ecosystem and have been listed as a threatened species since 1975. Efforts to protect the Grizzly bear have seen an increase in
Answers
Dimensional analysis is a mathematical technique used to analyze and convert physical quantities by considering their units.
Dimensional analysis is a powerful tool used in science and engineering to understand and manipulate physical quantities.
It involves examining the dimensions or units of various quantities involved in a problem and using their relationships to derive new equations or convert between different units.
The process of dimensional analysis starts by identifying the relevant quantities involved in a problem and expressing them in terms of their base units (such as meters, seconds, kilograms, etc.).
Then, the dimensions or units of these quantities are compared and manipulated using algebraic operations such as multiplication, division, and cancellation.
The justification for using dimensional analysis lies in the principle of dimensional homogeneity. According to this principle, any valid equation must have the same dimensions on both sides.
By carefully considering the units, dimensional analysis allows us to check the consistency of equations, identify missing terms, derive conversion factors, or solve for unknown quantities.
Dimensional analysis is particularly useful in verifying equations, checking the correctness of derived formulas, and performing unit conversions.
It helps ensure that the mathematical relationships used to describe physical phenomena are consistent with the underlying physical principles and laws.
Additionally, it provides a systematic approach to solving problems and ensures that the final results have the correct dimensions and units, which is crucial for accurate and meaningful interpretation of scientific data.
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You discover a new species of insect. You learn that its gamete contain 4 chromosomes each and contain 20 pg of DNA. Given this information, what can you conclude about this organism's somatic cells? a They will contain 4 sister chromatids. b They will contain 40 pg of DNA during GO c They will contain 2 chromosomes during prophase of mitosis. d They will be haploid (2n)
Answers
options a, b, and c are not accurate conclusions based on the given information.
The correct answer is d) They will be haploid (2n). Gametes are haploid cells, meaning they contain half the number of chromosomes as somatic cells. Since the insect's gamete contains 4 chromosomes, the somatic cells would have a diploid number of 8 chromosomes (2n = 8). The amount of DNA in the gamete is not necessarily indicative of the amount of DNA in the somatic cells, as somatic cells can undergo DNA replication and have varying amounts of DNA depending on the stage of the cell cycle.
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Compare and contrast the differences among EPROM, EEPROM and
flash memory. (9 marks)
(c) Compare and contrast the differences among EPROM, EEPROM and flash memory. (9 marks)
Answers
EPROM (Erasable Programmable Read-Only Memory) is a non-volatile storage device that holds its data even after the power is turned off. EPROM chips must be erased in entirety before they can be reprogrammed, and the erasing process can only be done under ultraviolet (UV) light.
EEPROM (Electrically Erasable Programmable Read-Only Memory) is a non-volatile memory that can be electrically erased in small blocks. EEPROM can be rewritten more than 100,000 times and doesn't require UV light for erasing. Flash Memory is a non-volatile storage medium that can be electrically erased and reprogrammed in chunks or pages. Flash memory is quicker to erase and write than EEPROM. Flash memory is widely used in portable devices, such as digital cameras, cellphones, and USB flash drives, among other things.
There are several differences among these three types of memory, which are outlined below:EPROM is a non-volatile memory that can be programmed only once, whereas EEPROM can be electrically erased and rewritten.EEPROM is simpler to erase and rewrite than EPROM, and it doesn't require UV light.EEPROM is faster than EPROM because it doesn't need to be completely erased before new data can be programmed.Flash memory is a non-volatile storage medium that can be programmed in blocks.Flash memory is faster to write and erase than EEPROM.
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Terrence noticed that his tomatoes became infested with stink bugs. In response, Terrence did not plant tomatoes for two growing seasons. This was to prevent the stink bugs from staying established in his crops. What type of IPM method did he employ? A. biological B. chemical C. cultural D. physical
Answers
Terrence employed a cultural IPM (Integrated Pest Management) method, The correct option is C.
Cultural methods in IPM involve manipulating agricultural practices or the environment to prevent or reduce pest populations. In this case, Terrence decided not to plant tomatoes for two growing seasons as a preventive measure against stink bugs. By avoiding the planting of tomatoes, Terrence disrupted the stink bugs' habitat and food source.
This cultural practice of crop rotation, or following, breaks the pest's life cycle and reduces the chance of stink bugs becoming established in his tomato crops. It deprives the pests of a consistent food source, making it more difficult for them to survive and reproduce. The correct option is C.
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Help please I’m begging I need help
Answers
Answer: decreases with decreased
Explanation:
Altitude is height above sea level.
The density of air decreases with height.
At higher altitudes, there is less air pushing down from above, and gravity is weaker farther from Earth's center.
So at higher altitudes, air molecules can spread out more, and air density decreases
Answer: I believe it is the first one