Natural selection can be defined as__. the evolution of a population of organisms a process in which changes in gene frequencies result from evolution the production of more offspring than can survive in a given environment a process in which organisms with certain inherited traits are more likely to survive and reproduce than individuals with other traits What did Darwin find in South America that suggested that the Andes mountains had been gradually lifted up over millions of years? bird fossils at the top of mountains in Argentina dinosaur bones in the Amazon basin marine snail fossils high up in the Andes mountains impressions of ocean waves at the top of a mountain Which of the following is a component of the fossil record? the distribution of murid rodents in Australia and Asia the similarity of the forelimbs of cats and bats molecular sequences bones of extinct whales The oldest known fossils are from about years ago. 3.5 billion 6,000 4.0 million 1.0 billion Homology is evidence of__. biogeography convergent evolution natural selection common ancestry Which of the following is a population? the termites infesting your house along with the microorganisms living in their guts all of the termites that have ever lived all organisms living in your house the termites infesting your house

Answer:Pancaking - shaking that causes a building's supporting walls to collapse and the upper floors to fall one on top of the other like a stack of pancakes.

Explanation:

Answer:

The answer is D

Explanation:

The closure of a plant's stomata will retain water when the plant becomes dehydrated and wilts.

Two guard cells surround each stoma, a small pore or hole, and they expand and contract to close and open the stoma. The carbon dioxide content and the plant's water balance act as two controls on the opening and shutting of the stomata.

Guard cells inflate and bend as a result of water entering them through osmotic movement. The holes are opened by the guard cells expanding. Through open stomata, the plant absorbs carbon dioxide for use in photosynthesis. Through open stomata, oxygen and water vapor are also expelled back into the atmosphere.

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Answer:

Although the evidence for a protective role of B cells and antibodies has been noted, the direct contribution of CD4+ T cells in protection against blood stages beyond a helper function for CD4+ T cells has mainly derived from rodent models of malaria.

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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but became hhfgbighhjgttty

Answer:

In order to be considered scientific, a hypothesis must be testable falsifiable and clearly stated

Explanation:

Answer: Vaccines contain weakened or inactive parts of a particular organism (antigen) that triggers an immune response within the body. Newer vaccines contain the blueprint for producing antigens rather than the antigen itself. Regardless of whether the vaccine is made up of the antigen itself or the blueprint so that the body will produce the antigen, this weakened version will not cause the disease in the person receiving the vaccine, but it will prompt their immune system to respond much as it would have on its first reaction to the actual pathogen.

1) How do partials move in different states of matter ?

=) Gas vibrate and move freely at high speeds. liquid vibrate, move about, and slide past each other. solid vibrate (jiggle) but generally do not move from place to place.

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Answer:

Metabolism involves exchanges of chemical matter with the external environment and extensive transformations of organic matter within the cells of a living organism. Metabolism generally involves the release or use of chemical energy. Nonliving things do not display metabolism.

Explanation:

Brainleast please

Answer:

parasitism

mutualism

commensalism

Explanation:

Commensalism is defined as a relationship between two living organism in which one organism get benefits and the other organism neither benefit nor harm.

Herbivory is defined as the relationship between organisms and plants in which organisms consume plant material.

Mutualism is defined as the relationship between two living organism in which  both organisms benefit each other.

Parasitism is defined as the relationship between two living organism in which one organism get benefits and the other organisms get harmed.

So, a flea and dog are an example of parasitism, certain bacteria live in the digestive tract of humans is an example of mutualism, and relationship between cattle egrets and an elephant is an example of commensalism.

Hence, the correct answer is:

parasitism

mutualism

commensalism

Answer:

It needs to be revisited because of the random acts of violence that it enables.

Explanation:

People that have access to weapons of mass destruction use them to kill people for no reason. For example, the sandy hook shooting, the recent Stoneman Douglas shooting, and the Christchurch shooting. All these shootings could have been prevented if there was stronger gun control. If people did not have access to automatic firing machine guns, less people would have died.

* DISCLAIMER *

All ideas expressed in this answer do not necessarily reflect my person views, they are meant for educational purposes, not to spark a debate about the 2nd amendment, do not get offended. (put this in cus some peeps crazy)

They are not made of cells and they cannot reproduce on their own.

a) Pharynx is a passageway for air, food, and water.

The pharynx is a passageway for air, food, and water in the respiratory and digestive systems. It is a muscular tube located behind the nasal cavity, mouth, and larynx. When you breathe, air passes through the pharynx on its way to the trachea and then into the lungs. When you swallow, food and water pass through the pharynx on their way to the esophagus for digestion. So, the pharynx serves as a common pathway for both air and food/water.

A hollow, muscular tube in the neck known as the pharynx begins behind the nose and empties into the larynx and oesophagus. The nasopharynx, oropharynx, and hypopharynx are the three components of the pharynx.

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During photosynthesis, there ligh dependent and independent reactions. Light dependent reactions are not influenced by temperature, but light independent reactions can be affected by the increase with temperature, due to some enzyme catalysis.

The answer is: True with limits.

Answer:

Resource partitioning is the division of limited resources by species to help avoid competition in an ecological niche. In any environment, organisms compete for limited resources, so organisms and different species have to find ways to coexist with one another.

Explanation:

Answer:

Resource partitioning is the division of limited resources by species to help avoid competition in an ecological niche.

Explanation:

In any environment, organisms compete for limited resources, so organisms and different species have to find ways to coexist with one another.

Photosynthesis in chloroplasts involves major steps such as light absorption, electron transport, ATP synthesis, and carbon fixation. It begins with light-dependent reactions in photosystems I and II, followed by electron transport and ATP synthesis.

Step 1: Photosynthesis is a complex process that occurs in the chloroplasts of plants, involving several major steps such as light absorption, electron transport, ATP synthesis, and carbon fixation.

Step 2:Photosynthesis is the process by which plants, algae, and some bacteria convert light energy into chemical energy in the form of glucose. It occurs in the chloroplasts, specifically in three main stages: light-dependent reactions, electron transport chain, and the Calvin cycle.

During the light-dependent reactions, light energy is absorbed by chlorophyll molecules in photosystem II (PSII) and photosystem I (PSI). In PSII, water molecules are split, releasing electrons, protons (H+ ions), and oxygen. The electrons move through an electron transport chain, creating a proton gradient across the thylakoid membrane. This gradient is essential for ATP synthesis by ATP synthase, using the energy from the electron flow.

In PSI, electrons are re-energized by absorbing more light energy and are ultimately used to produce NADPH, another energy carrier. The ATP and NADPH generated in the light-dependent reactions are then used in the Calvin cycle.

The Calvin cycle, also known as the light-independent reactions or carbon fixation, occurs in the stroma of the chloroplast. It uses ATP, NADPH, and carbon dioxide (CO2) to produce glucose (G3P), which serves as a building block for sugars and other organic compounds. The cycle regenerates the starting molecule, ribulose bisphosphate (RuBP), allowing the process to continue.

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The answer is that the night sky changes because of Earth’s orbit around the Sun, and as you’ll see, this also explains the path called the ecliptic on the celestial sphere.

According to the research, the correct option is transport. Most cells are relatively small for reasons related to the transport of substances into and out of cells.

They are mechanisms that allow substances to cross membranes and move molecules between the inside and outside of cells are essential for life.

In this sense, given that the cell constitutes the smallest and simplest form of biological organization, these functions of the plasmatic membrane are of great importance for the cell, if the cells were incapable of carrying out said transport, the organism would not carry out its vital activities .

Therefore, we can conclude that according to the research, the correct option is transport. Most cells are relatively small for reasons related to the transport of substances into and out of cells.

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The most likely explanation for the lack of a filter blocking the passage of alcohol between the maternal and fetal circulations in humans is that: there has not been enough time to evolve such a barrier.

The placenta is an organ that is formed during pregnancy and is responsible for providing nutrients and oxygen to the developing fetus while also eliminating waste products. It also acts as a barrier between the maternal and fetal circulations, protecting the developing fetus from potentially harmful substances in the maternal bloodstream.

However, the placenta is not completely impermeable, and some substances, including alcohol, can cross the placental barrier and enter the fetal circulation. The amount of alcohol that reaches the fetus depends on a number of factors, including the amount of alcohol consumed by the mother, the timing of consumption, and individual variations in metabolism and other factors.

Alcohol is a known teratogen, meaning that it can cause abnormalities in fetal development. Because of this, it is recommended that pregnant women avoid alcohol consumption whenever possible. However, the exact reasons for why there is a lack of a filter blocking the passage of alcohol between the maternal and fetal circulations in humans are not fully understood.

One possibility is that there has not been enough time for humans to evolve such a barrier, as alcohol consumption is a relatively recent phenomenon in human history. Another possibility is that such a barrier would also block important molecules that need to be passed to the fetus, making it difficult to develop a filter that could selectively allow certain substances to pass through while blocking others.

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Answer:

B. These places once had a warmer climate.

Explanation:

They're fossils meaning they're extremely old therefore the climate they once grew in was suitable for its needs until the climate changed causing them to die.

Reproductive cloning is the process of developing several embryos from a single embryo in order to produce genetically similar creatures. The correct option is A.

Thus, reproductive cloning attempts to create kids whose genetic make-up is exactly like that of the parent or source organism. This method differs from therapeutic cloning, which concentrates on developing cloned embryos in order to collect stem cells for use in medical procedures.

The process of somatic cell nuclear transfer, which is employed in both therapeutic and reproductive cloning, involves transferring a somatic cell's nucleus into an egg cell in order to produce an embryo.

Thus, the ideal selection is option A.

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Answer:

The body regulates those levels in an example of homeostasis. When levels decrease, the parathyroid releases hormones. If calcium levels become too high, the thyroid helps out by fixing calcium in the bones and lowering blood calcium levels. The nervous system helps keep homeostasis in breathing patterns.

Explanation:

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Answer:

Look below.

Explanation:

They maintain homeostasis by regulating temp, glucose, toxins, blood pressure, and pH.

Answer:

C and D combine to produce A and B.

Explanation:

The chart you were given is shown in the image I attached below. The options you were given are the following:

Photosynthesis is a process in which organisms that possess the pigment called chlorophyll (most plants and some protists and bacteria) produce the energy necessary for their survival. With the help of sunlight, they convert water (D), carbon dioxide (C), and minerals into oxygen (B) and glucose (A).

This is why the second option is the correct one.

Answer:

c and d combined to produce both A and B

Explanation:

The correct answer is e) acute inflammation. Activation of C3a leads to the release of inflammatory mediators, which causes an increase in permeability of the blood vessels, opsonization to facilitate phagocytosis of invading pathogen, and cell lysis. These changes result in acute inflammation.

Acute inflammation is the body’s tissue-level response to an injury, infection, or irritant. It is a short-term response characterized by redness, heat, swelling, and pain. When the body senses a possible injury, infection, or irritant, it triggers the inflammatory response by sending chemicals and white blood cells to the affected area in an effort to break down the offending agent and help protect, repair, or remove tissue that may be damaged. This inflammatory response serves as an important defense and protective mechanism for the body.

Phagocytosis is a process in which the cell engulfs and digests molecules, cells, or other particles. It is a form of endocytosis in which specialized cells called phagocytes engulf particles, such as bacteria and other foreign particles, in their plasma membrane and consume them. Phagocytosis is an important mechanism of the immune system, as it can kill pathogens and other foreign particles that can potentially cause harm if allowed to circulate in the body.

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Answer:The rock formations of eastern North America, Western Europe, and northwestern Africa were later found to have a common origin, and they overlapped in time with the presence of Gondwanaland. Together, these discoveries supported the existence of Pangea.When Rodinia broke up, it split into three pieces: the supercontinent of Proto-Laurasia, the supercontinent of Proto-Gondwana, and the smaller Congo craton. Proto-Laurasia and Proto-Gondwana were separated by the Proto-Tethys Ocean.

Don't take my full word on it, this is what i think

Explanation:

Answer:

When Rodinia broke up, it split into three pieces: the supercontinent of Proto-Laurasia, the supercontinent of Proto-Gondwana, and the smaller Congo craton. Proto-Laurasia and Proto-Gondwana were separated by the Proto-Tethys Ocean.

The number of cavities in each part of the human body when split into two halves would be ;  4 cavities

The human body contains 8 different cavities whose main functions are to protect sensitive organs from shock and also allows the change in size and shape seen in the organs they protect.

The 8 different cavities are ;

i) Serous membranes, ii)thoracic cavity,  iii)Ventral body cavity, iv)Abdominopelvic Cavity, v) Retroperitoneal space,  vi)Pelvic cavity, vii)Dorsal cavities and  viii) Ventral cavity

Therefore we can conclude that when the body is divided into 2 equal parts each part will have at least 4 cavities.

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The head is often emphasized in African artwork due to its symbolic significance. In many West African cultures, the head has long been seen to have a physical, spiritual and even metaphysicalmeaning.

As the site of a person’s wisdom, identity, and innermost thoughts, the head was seen to be a conduit for communication between mortals and gods. It was the seat of thought, of knowledge, of understanding, and was believed to be the source of a person’s power. African artwork seeks to honor and honor this power, and often depicts a human head as larger than its accompanying body.

This physical representation of the spiritual weight of the head draws attention to the power and significance it holds, and serves as a reminder of the importance of knowledge, identity, and spirit in African culture.

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Correct question is :

what part of the body is emphasized in african artwork due to its association with knowledge and identity, and its connection with a person’s spirit?

ATP and NADPH are produced by light-dependent reactions, which convert light energy into chemical energy. The correct answer is (i) light-independent reaction.

In photosystems, the reactive center gives off electrons that are carried along a chain of pigments. These pigments use the electrons' energy to pump H+ ions into the thylakoid from the stroma, creating a proton motive force that the ATP synthase enzyme will use to make ATPs. The electrons are eventually transferred to NADP+, which is reduced to NADPH (two electrons per molecule). When sunlight photolyzes a water molecule, it releases H+, O-, and two free electrons that are used to replace the lost electrons in the reactive center of the photosystem. Photophosphorylation refers to the entire procedure.

More or less, photosynthesis is a significant peculiarity for autotrophs like plants where they combine their food (glucose) from an inorganic source (CO2) utilizing energy from daylight. However, there are two stages to the photosynthetic process, which consists of more complex reactions: a stage that is light-dependent and light-independent.

To ease carbon dioxide and alter the fuel into the chemical bond energy found in carbohydrates like glucose.

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