Omar often saw woodpeckers perched in trees in his backyard, but he never saw them at his bird feeders. Omar usually filled his feeders with sunflower seeds. He wondered if he could attract woodpeckers by adding a different type of food to the feeders.
To test this idea, Omar gathered eight identical bird feeders. He filled four with sunflower seeds. He filled the remaining four feeders with crushed peanuts. Omar then placed the bird feeders in his backyard. Over the next five days, he counted the number of woodpeckers that visited each bird feeder each morning.
Which of the following was an independent variable in this experiment?
Answers
Answer: The food
Explanation: the independent variable is the one to be changed and in this case, it is the food
Related Questions
2 Points
What is the purpose of the Bill of Rights?
O A. To persuade Great Britain to change its policies
O B. To inform the public about the king of England's crimes
O C. To explain the rights of citizens of the United States
O D. To ask people to become citizens of the United States
SUBM
Answers
researchers look for segments of chromosomes, larger than genes, that are similar in arrangement between distant species. such segments may reveal relatedness and chromosome rearrangements that have happened in the evolutionary past. what are such segments identified by?
Answers
Researchers look for segments of chromosomes, larger than genes, which are similar within the arrangement between remote species: Homology, such segments recognized.
A chromosome is a long DNA molecule with components or all the genetic fabric of an organism. In maximum chromosomes the very long skinny DNA fibers are lined with packaging proteins; in eukaryotic cells, the maximum critical of these proteins are the histones.
A shape found within the nucleus of a cellular. A chromosome is made of proteins and DNA organized into genes. every mobile commonly consists of 23 pairs of chromosomes.Chromosomes are structures discovered inside the middle (nucleus) of cells that deliver long portions of DNA. DNA is the fabric that holds genes. it's miles the building block of the human body. Chromosomes additionally include proteins that assist DNA in existing in the right form.
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identifying an autosomal recessive mutation in a mutagenic screen in drosophila requires identification of a mutant in the f3 generation. if testing for a sex-linked recessive lethal mutation (e.g., cn) using a balancer chromosome such as cncyo, in which generation can lines with mutations be identified?
Answers
To identify a sex-linked recessive lethal mutation using a balancer chromosome such as cncyo in Drosophila, lines with mutations can be identified in the F1 generation.
A balancer chromosome is a specialized chromosome used in Drosophila genetics to maintain the integrity of a specific genotype during breeding.
In the case of a sex-linked recessive lethal mutation, the balancer chromosome contains multiple inversions that prevent recombination and help maintain the recessive lethal mutation along with visible markers.
The cncyo balancer chromosome, for example, carries the cn mutation, which is recessive and lethal when homozygous.
When performing crosses with a balancer chromosome, the F1 generation will inherit one copy of the balancer chromosome along with the recessive lethal mutation.
The visible markers on the balancer chromosome, such as eye color or wing shape, can be used to identify the presence of the balancer chromosome and, by extension, the presence of the recessive lethal mutation.
If a line exhibits the phenotypic markers associated with the balancer chromosome, it indicates the presence of the recessive lethal mutation.
Therefore, lines with mutations can be identified in the F1 generation when testing for a sex-linked recessive lethal mutation using a balancer chromosome in Drosophila.
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Which of the following statements describe situations of passive transport across a cell membrane? (Choose all that apply)
-A cell uses energy to move molecules across a membrane from an area of lower concentration to an area of higher concentration.
-Water is moved across a membrane to dilute a molecule that is highly concentrated on the other side.
-A cell removes specific molecules through a membrane based on size.
-A molecule disperses to create a uniform concentration throughout a solution
Answers
Answer: molecule disperses to create a uniform concentration throughout a solution
The statements that describe situations of passive transport across a cell membrane are:
B. Water is moved across a membrane to dilute a molecule that is highly concentrated on the other side.
C. A cell removes specific molecules through a membrane based on size.
Cell transport refers to the movement of ions, molecules, or substances across the cell membrane, either into or out of the cell of a living organism.
Basically, the two (2) main types of cell transport are:
Active transport.Passive transport.Passive transport involves the movement of substances across the cell membrane without the use or expenditure of chemical energy.
Generally, passive transport is highly dependent on the second law of thermodynamics for the movement of chemical substances across a cell membrane.
The characteristics of passive transport include the following:
Water is moved across a membrane to dilute a molecule that is highly concentrated on the other side. A cell removes specific molecules through a membrane based on size.Read more: https://brainly.com/question/18646362
All of the following increase during the fight-or-flight reaction EXCEPT a.perspiration. b.heart rate. c.blood sugar. d.digestion.
Answers
During the fight-or-flight reaction, the body undergoes a series of physiological changes to prepare for an immediate response to a perceived threat or danger. These changes are orchestrated by the sympathetic nervous system and involve the release of stress hormones, such as adrenaline (epinephrine) and noradrenaline (norepinephrine). So the correct answer is option D.
The fight-or-flight response is characterized by an increase in heart rate , which helps to pump more oxygenated blood to the muscles and vital organs, preparing the body for action. Additionally, blood sugar levels increase as the liver releases stored glucose into the bloodstream, providing a readily available energy source for the body to cope with the perceived threat.
Perspiration also increases during the fight-or-flight response. Sweating helps to regulate body temperature and cool down the body during periods of increased physical activity or stress.
On the other hand, digestion is inhibited during the fight-or-flight reaction. The body redirects blood flow away from the digestive system and towards the muscles and other essential organs involved in the stress response. This redirection of blood flow prioritizes immediate survival needs over non-essential functions like digestion.
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The coils of a radiator provide a large surface area from which heat is radiated into a room. Which organelles have a structure similar to that of a radiator? How is their structure related to their function? Answer in 5 to 7 sentences
Answers
With more surface area, the cell may more effectively use the transport of nutrients and heat into its interior organelles.
What Are in Cell Organelles?An organelle is a subcellular structure that, like an organ in the body, has one or more specific tasks to carry out within the cell. The nucleus, which house genetic material, the mitochondria, which generate chemical energy, and the ribosomes, which put together proteins, are some of the more significant cell organelles. Small cytoplasmic structures known as organelles perform tasks required to keep the cell's homeostasis in check. They play a role in a variety of functions, including the synthesis of proteins and secretions, the removal of toxins, and the processing of outside signals.To learn more about Cell Organelles refer :
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Which of the following is not true about sexual reproduction?
A.) Sexual reproduction involves gametes.
B.) Through sexual reproduction, traits and characteristics of the species are passed to the offspring.
C.) Most multicellular organisms reproduce through sexual reproduction.
D.) Sexual reproduction involves the simple division of a cell.
Answers
As sexual reproduction results in genetic variation. So the traits are not passed.
Which of the following best describes a tissue?
Group of answer choices
A group of organs that all have similar functions.
A group of similar cells that serve the same purpose
A random collection of cells.
A singe cell that has a specific function.
Answers
Answer:
I would say b
Explanation:
it would be b because tissues that are similar form one organ but a group of organs is a system so its b.
The best statement that describes a tissue is - A group of similar cells that serve the same purpose.
In multicellular organisms, tissue is a cellular organizational level that is present between similar cells and a complete organ. It is a group of cells that have a similar structure and function.
The space between cells in tissue is filled with a nonliving material, the intercellular matrix that varies from tissue to tissue in amount.Various tissues then undergo organization to form organs. Cells are the most basic part of an organizationtissues make muscles that help in movementThus, "A group of similar cells that serve the same purpose" is best describes tissue.
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Which of the following efforts is used in the enforcement of the Kyoto
Protocol?
A. Trading carbon credits among countries
B. Monitoring the ozone hole over Antarctica
C. Banning aerosols in every country
D. Banning CFCs worldwide
Answers
2.if a mutation introduces a new skin color in a lizard population, which factor might determine whether the frequency of the new allele will increase?
Answers
The factor that might determine whether the frequency of the new allele will increase is natural selection.
The frequency of the novel allele is more likely to rise over time if it benefits the lizards in its environment, such as by improving camouflage or body temperature regulation. Natural selection is a process by which organisms with beneficial qualities are more likely to survive and reproduce, transferring those traits to their progeny. If a lizard with the new allele has an advantage due to the color, they are more likely to survive and pass that allele on to its progeny. This is the situation with the new skin color in the lizard population.
However, the frequency of the new allele is less likely to rise if it does not offer an advantage or is harmful to the lizards in their environment. In this circumstance, the allele may remain rare or finally disappear from the population. Hence, whether or not the new allele will become more common depends on how the environment interacts with the new skin tone.
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Why did contamination continue and spread after the initial contamination of the Hudson River was stopped?
Will give brainliest if you give a good answer!
Answers
Answer:
The Hudson River was contaminated when General Electric dumped a huge amount of polychlorinated biphenyls (PCBs) into the Hudson River between 1947 and 1977.
General Electric proposed a plan of sediment dredging to clean up the polychlorinated biphenyls (PCBs) in the river but the PCBs are not safely buried in the sediment and dredging was not enough to clean up the PCB. This PCB has already entered the food web and the underground water of the Hudson River was also already spread in different places, so dredging was not enough to clean up the PCB.
Answer:
It continued because they didn't fully clean up all of the contamination as well as the fact that the wildlife was still living in the contaminated waters. This allowed for the contamination issues to continue for decades after the initial date it happened.
Explanation:
Lowkey the other guy said it better but this is what I put
Calculate the potential energy of a 25kg boulders at the ledge of a 150m high
Answers
Answer:
36750J
Explanation:
Potential energy, which is the energy of a body at rest or in a position is calculated as follows;
P.E = m × g × h
Where;
m = mass (kg)
g = acceleration due to gravity = 9.8m/s²
h = height of the boulder (m)
According to the provided information;
m = 25kg, h = 150m
Using P.E = m.g.h
P.E = 25 × 9.8 × 150
P.E = 36750 Joules
the outermost layer of human skin provides an effective barrier against microbial invasion, mainly due to the presence of thick, closely packed cells called blank . multiple choice question. keratinocytes leukocytes sclerocytes lymphocytes'
Answers
The outermost layer of human skin provides an effective barrier against microbial invasion, mainly due to the presence of thick, closely packed cells called keratinocytes.
What is Epidermis?
Human Skin is the first line of defense that provides protection from microbial invasion. Epidermis is the topmost layer of the skin. This layer consists of thick cells packed with keratin. The presence of these keratin cells helps the skin prevent microbial invasions.
What are keratinocytes?
Keratinocytes are skin cells that produce keratin, a fibrous protein. They are the most abundant cells in the epidermis, the outermost layer of the skin. The epidermis is a thin layer that is only 0.1 mm to 0.2 mm thick, but it serves as a physical barrier to protect the body against the environment by keeping water and infectious agents out and the body's fluids inside.
How do keratinocytes act as a barrier to microbes?
The cells of the epidermis are keratinocytes, which produce a protein called keratin that forms a protective layer on the surface of the skin. The outermost layer of human skin provides an effective barrier against microbial invasion, mainly due to the presence of thick, closely packed cells called keratinocytes. When there is microbial invasion, it is difficult for the microbes to penetrate through the epidermis because of the tightly packed keratinocytes.
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D. the amount of distilled water in the beaker has increased
are the answer choices
Answers
Answer:
The answer is B.
Explanation:
Model cell has high concentration of molecules but low water potential so osmosis occurs where the water enter the cell through the dialysis tubing causing the diameter to increase.
Starch is unable to diffuse out between it is a large insoluble molecules.
How many carbons are found in a glucose molecule?
Answers
Answer:
there are six carbon atoms
Answer:
there are six carbon atoms
briefly describe what the outer layer of bone tissue is like
Answers
Answer:
dinkachika
jingalalalalallalal
Answer:
Plz refer image for your answer
Explanation:
Hope it helps.. if yes plz mark me as brainliest
How long did insects fly before birds?
Answers
what does allele frequency tell you about a population
-The number of alleles each individual has
-The number of different individuals in a population
The number of different alleles in a population
Answers
The answer is: the number of different alleles in a population.
So let’s do an example:
Allele frequency tells you how common (frequent) an allele is.
An allele is a version of a gene.
let’s say theres a gene (instruction) for eye colour. And We can make different types of eyes.
brown, green, blue.
So we can say the gene (instructions) has 3 alleles (3 variations)
If you have an high allele frequency for the brown allele in group A. It means that brown eyes are super common in group a.
Now It can get a little complicated and the details are not needed for this question. if you want an slightly more in-depth explanation but I’ve added a little detail bellow:
There are three things that can happen in genetics.
1) You can have an allele for brown eyes and have brown eyes, (it shows in your phenotype)
2) You can have the allele for brown eyes and NOT have brown eyes (it doesn’t get expressed so it doesn’t show up in the person). Here you have the genetic code for it but you don’t express it. It doesn’t actually show up so you end up with blue eyes or something.
or
3) you can not have the allele for brown eyes so it’s not in your genetics and it doesn’t show up in your phenotype.
If there. Is a high allele frequency for brown eyes. It means that we analysed the genetic code of everyone in group A and found that a lot of people in this group have the allele for brown eyes EVEN the people who don’t show brown eyes in their phenotype.
If this is a little confusing please don’t worry you don’t need this level of detail to understand this question.
The answer for this question is: the number of different alleles in a population.
Which is a limiting nutrient for plant growth?
water
nitrogen
carbon
oxygen
Answers
Answer:
Nitrogen
Explanation:
Nitrogen and phosphorus are among the elements considered most limiting to plant growth.
Hope it helps!
The limiting nutrient for plant growth is:
B. Nitrogen
Others are needed for the growth of plants.
Nutrients for plant growth:Supplement lacks can present genuine dangers to establishing efficiency, supplements can become poisonous in abundance, which is likewise dangerous. Whenever a few micronutrients gather to extremely undeniable levels in plants, they add to the age of responsive oxygen species (ROS), which can cause broad cell harm.
The nutrient that is required in a minimum amount for plant growth is Nitrogen.
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Identify the term that correctly completes the following statement. select the best answer. in the native american culture, bears represent a fatherly archetype and grandfather archetype, which would be part of your [blank].
Answers
Bears are said to represent fatherly and grandfatherly archetypes in native American culture, which would be a part of your collective consciousness.
What does the term "archetype" mean?anything of the same kind is a representation or copy of the original pattern or model: the House of Commons, which serves as the model for all modern representative legislatures Thomas Babington Macaulay is another excellent illustration. He embodies the ideal successful businessman.
What kind of archetype is that?The Hero is the most well-known archetype. Hero tales share certain characteristics; heroes typically begin in ordinary situations, are "drawn to adventure," and ultimately must face their greatest fear in a fight that profoundly alters the hero.
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A plant can have either broad leaves (b) or narrow leaves (b). A plant with genotype bb is crossed with a plant with genotype bb. Which punnett square correctly represents this cross?.
Answers
Option C is the Punnett square that accurately depicts the hybridization of a genotype BB and a genotype Bb plant.
The genotypes of a specific cross or breeding experiment are predicted using a square diagram known as the Punnett square. It has the name of Reginald C. Punnett, who developed the strategy in 1905. The likelihood that a child will have a specific genotype is calculated by biologists using the diagram. The Punnett square is a table that lists all conceivable ways that paternal and maternal alleles might be combined.- These tables can be used to investigate the genotypical outcome probability of kids carrying a single trait (allele) or when multiple traits from the parents are crossed.
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PLS HELP ME
what is the probability of two purple flowers in this punnett square having heterozgeneous offspring?
A. 25%
B. 50%
C. 75%
D. 100%
*no links*
Answers
Answer: B
Explanation:
Glycolysis is the first of three steps in cellular respiration. Review glycolysis by matching each phrase on the right with a term on the left. Some terms are used twice.
____1. Compound formed between glucose and pyruvic acid
____2. Not involved in glycolysis
____3. Fuel molecule broken down in glycolysis
____4. Produced by substrate-level phosphorylation
____5. Invested to energize glucose molecule at start of process
____6. Reduced as glucose is oxidized
____7. Glucose converted to two molecules of this
____8. Assembled to make ATP
____9. "Splitting of sugar" 10. Carries hydrogen and electrons from oxidation of glucose
A NADH
B. Pyruvic acid
C ATP
D. NAD
E .Glucose
F. Glycolysis
G. ADP and P
H.Oxygen
I. Intermediate
Answers
Answer:Glycolysis is the first of three steps in cellular respiration. Review glycolysis by matching each phrase on the right with a term on the left. Some terms are used twice.
____1. Compound formed between glucose and pyruvic acid
____2. Not involved in glycolysis
____3. Fuel molecule broken down in glycolysis
____4. Produced by substrate-level phosphorylation
____5. Invested to energize glucose molecule at start of process
____6. Reduced as glucose is oxidized
____7. Glucose converted to two molecules of this
____8. Assembled to make ATP
____9. "Splitting of sugar" 10. Carries hydrogen and electrons from oxidation of glucose
A NADH
B. Pyruvic acid
C ATP
D. NAD
E .Glucose
F. Glycolysis
G. ADP and P
H.Oxygen
I. Intermediate
Explanation:
The answer to the statements are:
A. NADHB. Pyruvic acidC ATPD. NADE . GlucoseF. GlycolysisG. ADP and PH.OxygenI. IntermediateWhat are cellular respiration and its purpose?Cellular respiration is the system that occurs inside the mitochondria of organisms (animals and plants) to break down sugar inside the presence of oxygen to release strength in the form of ATP. This system releases carbon dioxide and water as waste products.
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Give an example of a common “parent-daughter” combination.
the passages is downs below
A common "parent-daughter" combination that geologists use is radioactive uranium and non-radioactive lead. As shown in the diagram above, uranium is trapped in a newly formed rock. As the rock ages, more and more of the uranium changes into lead.
The age of the rock in years can be found by measuring the rate at which a parent element decays and then measuring the ratio of parent element to daughter element in the rock. The ages in years of the different geological time periods are found by measuring the absolute ages of many rocks from all of the different periods. The absolute ages of some of the different geologic time periods are shown along the right side of the Staircase of Time.
The steps of the Staircase of Time are drawn to be almost the same size, so you might think that the time periods are the same length, but they are not. The absolute ages of rocks taken from the different time periods have shown that the time periods were of greatly differing lengths. Some were very short, like the Quaternary period (only 2 million years), while others were very long, like the Proterozoic Era (almost 2 billion years). According to absolute-age measurements, an accurate representation of the lengths of the major geologic time periods is shown in the time bar at right.
link: http://www.cotf.edu/ete/modules/msese/earthsysflr/ages.html
Answers
A common "parent-daughter" combination that geologists use is radioactive uranium and non-radioactive lead.
What is the "parent-daughter" combination about?The passage that is provided above is discussing a method used by geologists to determine the age of rocks. The method is based on the principle of radioactive decay, which is the process by which an unstable, or radioactive, element changes over time into a stable, or non-radioactive, element.
A common "parent-daughter" combination used by geologists is radioactive uranium (parent element) and non-radioactive lead (daughter element).
Therefore, the passage further explains that the age of different geological time periods can also be found by measuring the absolute ages of many rocks from all of the different periods.
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2. Curly hair is recessive (s), and straight hair is dominant (S). A woman with curly hair (ss) marries a man who is a true breeder for straight hair (SS). What percentage of their children will have curly hair, and what percentage of them will have straight hair?
% Curly-
% Straight-
Answers
Straight 100% or
Curly 25% and straight 75%
Straight-50
Does a domain or kingdom contain more organisms?
Answers
Answer:
A domain contains more organisms
Answer:
The chart below shows how the kingdoms have changed over time.
Explanation:
As scientists began to understand more about DNA, evolutionary biologists established a new taxonomic category—the domain. A domain is a larger and more inclusive category than a kingdom. There are three domains—Bacteria, Archaea, and Eukarya.
how do plants obtain sugars and energy to maintain and build their bodies?
Answers
Food is produced by plants through a process known as photosynthesis.Plants use their leaves to capture light energy during photosynthesis.Carbon dioxide and water are converted by plants into a sugar known as glucose using the power of the sun.
How do plants get their own energy and matter to generate food?Instead, plants create glucose, a type of sugar they require to exist, using sunshine, water, and airborne gases.All plants, algae, as well as some microbes engage in a process known as photosynthesis.
How do plant cells create sugars from sunlight and convert the sugars into the chemical ATP?During in the process of photosynthesis, which transforms light energy into the chemical energy stored as glucose, the chloroplast in a plant cell produces sugar.Sugar is broken down in mitochondria during the cellular respiration process into energy that plants can use to survive and thrive.
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Coronary arteries are responsible for supplying oxygenated blood to heart muscle. Most heart attacks are caused by the narrowing of these arteries due to arteriosclerosis, the deposition of plaque along the arterial walls. A common physiological response to this condition is an increase in blood pressure. A healthy coronary artery is 3.0 mm in diameter and 4.0 cm in length. Part A Consider a diseased artery in which the artery diameter has been reduced to 2.3 mm. What is the ratio Q diseased/Qhealthy if the pressure gradient along the artery does not change? IVALO ? Qdiseased/Qhealthy =
Answers
The ratio Q diseased/Qhealthy if the pressure gradient along the artery does not change is 0.41.
Coronary arteries play a vital role in supplying oxygenated blood to the heart muscles. However, when these arteries get narrowed due to the deposition of plaque, a condition called arteriosclerosis, it can lead to heart attacks, this condition triggers an increase in blood pressure as a physiological response. A healthy coronary artery has a diameter of 3.0 mm and a length of 4.0 cm. Now, let's consider a diseased artery with a diameter of 2.3 mm. We need to find the ratio of blood flow in this diseased artery to that of a healthy one, assuming the pressure gradient along the artery does not change. This ratio is represented as Qdiseased/Qhealthy.
The flow rate of blood in a vessel is directly proportional to the fourth power of its radius. Therefore, we can use the Poiseuille's law to calculate the ratio. The equation is Q = πr^4ΔP/8ηL, where Q is the flow rate, r is the radius, ΔP is the pressure gradient, η is the viscosity, and L is the length of the vessel. Since the pressure gradient is constant, we can cancel it out in the ratio calculation. Hence, Qdiseased/Qhealthy = (2.3/2)^4 = 0.41. Therefore, the ratio of blood flow in the diseased artery to that of a healthy one is 0.41.
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Where does cellular respiration occur within the cell?
O A. Extracellular space, cytoplasm,
inside mitochondria.
B. Cytoplasm, mitochondrial
matrix, inner mitochondrial
membrane.
C. Cytoplasm, inner mitochondrial
membrane, mitochondrial
matrix.
Answers
Answer:
B. Cytoplasm, mitochondrial
matrix, inner mitochondrial
membrane.
Explanation:
The aerobic respiration is made up of different processes:
a) Glicolysis, which takes plays in the cytosol of the cell
b) Oxidative decarboxylation of pyruvate and Krebs circle which occurs in the mitochondrial matrix
c) Oxidative phosphorylation which occurs in the mitochondrial cristae
Compare
Compare the charges and masses of
protons, neutrons, and electrons.
Answers
Answer:
Protons and neutrons have very similar mass, while electrons are far lighter, approximately 11800 times the mass.
Protons are positively charged, neutrons have no electric charge, electrons are negatively charged. The size of the charges is the same, the sign is opposite.
Explanation:
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