The number of cells increases very quickly and cells have been dividing for millions and millions of years. But the number of cells on the planet stay relatively constant. Why?

Answer:

Activated platelets express negative phospholipids on the exterior leaflet of their cell membrane, release vasoactive compounds, release cytokines, and release growth factors.

When an injury causes a blood vessel wall to break, platelets are activated. They change shape from round to spiny, stick to the broken vessel wall and each other, and begin to plug the break. They also interact with other blood proteins to form fibrin.

Platelets contribute their hemostatic capacity via adhesion, activation and aggregation, which are triggered upon tissue injury.

Explanation:

Gold fish and wild crucian carp can survive in low oxygen environment .

Gold fish have special properties it is evolved from the enzyme component that are specialized to convert carbohydrates into alcohol that can be released through the gills when oxygen level dropped.

Another most common oxygen response of fishes during oxygen deficient environment is aquatic surface respiration . During this behavior, fish halt just below the surface, put their nose at the air-water juncture and breathe in the level of water that is in direct contact with the air. This juncture of water is comparatively richer in oxygen content.

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Answer:

The. Answer. Is. B

The correct answer is b. Through a conformational change of the receptor. When a signaling molecule binds to the receptor on the cell surface, it causes a conformational change in the receptor.

This change leads to the activation of the receptor, which triggers a cascade of intracellular signaling events that ultimately transmit the information from the signal into the cell. The intracellular signaling events can involve the activation of enzymes, such as protein kinases or phosphatases, or the release of second messengers, such as cAMP or Ca2+. These events lead to changes in gene expression, protein synthesis, or cell metabolism, which allow the cell to respond appropriately to the signal. Endocytosis of the signaling molecule with the receptor may occur, but it is not the primary mechanism by which the activated receptor transfers information into the cell. Increased expression of the receptor may occur as a result of the signaling events, but it is not the initial step in the process. Therefore, the correct answer is b.

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A sort of interaction known as mutualism involves both parties gaining something from the other. For instance, a butterfly carries pollen from one plant to another that is far away after receiving nectar from the blossom of a plant, which is a rich source of nourishment. John N. Thompson proposed the following thought experiment to help people consider the pervasiveness of mutualism: try to picture a plant species that can survive in its natural environment without also utilizing the genomes of a mitochondrion, a chloroplast, several mycorrhizal fungi, numerous insects to pollinate it, and numerous species of birds to disperse its seeds.

Mutualistic interactions are thought to have played a significant influence in the diversification of life on Earth. Mutualism is present everywhere.

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Answer:

Subsoil is the layer of soil below the topsoil. ... The layer of soil closest to our feet is topsoil. Geologists refer to it as the “A” horizon, whereas subsoil is the “B” horizon. Topsoil is much more fertile than subsoil because it contains more organic matter, thus giving it a darker color.

Answer:

subsoil is the layer underneath the surface topsoil, which consists of greater minerals and materials of iron and aluminium compounds than topsoil. The subsoil tends to be more compact than topsoil, since it does not hold any air in the soil.

Explanation:

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N = 1.386 Ne. and the value of N is a little over 100. After 20 generations of random mating, the heterozygosity of the isolated wildflowers is half of what it was at the start. The effective population size formula that can be used is                        N e = (1/2H) 2N / (2NH - H).

According to the given statement, Diploid wildflowers from a large population are transplanted to a location where they are reproductively isolated from the original population. Their heterozygosity is measured each generation. After 20 generations of random mating, their heterozygosity is half of what it was at the start. The value of N must be estimated. We know that the effective population size is the size of the population that would have the same rate of genetic drift as the actual population.

The effective population size (N e) can be expressed as shown below:

Ne = 4N 1 N 2 / (N1 + N 2) In this formula, N 1 and N 2 are the number of organisms in the two populations.

Thus, after 20 generations of random mating, the heterozygosity of the isolated wildflowers is half of what it was at the start, indicating that: Heterozygosity after 20 generations = 1/2

Heterozygosity at the start or Heterozygosity at the start = 2 (Heterozygosity after 20 generations). The effective population size formula that can be used here is:

Ne = (1/2H) 2N / (2NH - H) Where H is the heterozygosity at the beginning and N is the effective population size.

We can use the Hint given in the question to find that the above equation is approximately:

Ne = (1/4) N/ ln (2) So, N/ ln (2) = 4Ne or N = 4Ne ln (2) ≈ 1.386NeThus, N ≈ 1.386Ne.

The value of N is a little over 100, which is what we can expect.

After 20 generations of random mating, the heterozygosity of the isolated wildflowers is half of what it was at the start. Therefore, the effective population size formula that can be used is N e= (1/2H) 2N / (2NH - H).

Thus, N ≈ 1.386 Ne. and the value of N is a little over 100.

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Answer:

As the water flows down, it may pick up more water from other small streams, springs or or from rain or snow melt. ... Small rivers and streams may join together to become larger rivers. Eventually all this water from rivers and streams will run into the ocean or an inland body of water like a lake.Water can be introduced into rivers and streams through surface runoff, springs, groundwater discharge, melting ice and snow, and precipitation. ... The water at the source of the river has high oxygen content, but the width and depth are typically less than they are in the middle sections. The most simplistic answer is that all the water in a river comes from the sky—and that is certainly true, as streamflow is one part of the water cycle. It is also true that most of the water flowing in rivers comes from precipitation runoff from the surrounding landscape (watershed).

The class of organic molecule is used as an immediate energy source for most organisms is carbohydrates.

A complex molecule known as an organic is predominantly composed of carbon atoms joined to other atoms of the same element and/or other carbon atoms. Each and every living thing on Earth is made up of organic molecules. Atoms that are bound together form molecules. Because they are related to living things, organic molecules are given that term.

The body uses carbohydrates as its primary fuel source. Simple sugars are created during digestion by the breakdown of sugars and carbohydrates. Once in the bloodstream, where they are known as blood sugar, they are then absorbed (blood glucose). Insulin is then used to assist glucose enter the cells of the body.

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A pure tall pea plant is crossed with a pure short pea plant. All of the resulting offspring were tall.

If a pea plant with a tall pea (TT) is crossed with a pea plant with a short pea (tt), where the tall stem is dominant, then the cross is as follows:

Parents:  TT >< tt

Gametes: T >< t

Descendants: Tt

Thus, the crossing of the two parents produces all tall offspring.

This cross is called a monohybrid cross, which is a cross with one different trait. The point is that in this cross, only pay attention to one characteristic, such as flower color (red, white, etc.) or fruit shape (round, oval, etc.).

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The deep facial bones that separate the oral and nasal cavities and form the nasal septum are known as the ethmoid bone, the vomer bone, and the maxilla bone.

These bones are responsible for maintaining the structural integrity of the face and supporting the various functions of the oral and nasal cavities. The ethmoid bone, in particular, plays a crucial role in separating the two nasal cavities and providing structural support for the nasal passages. The vomer bone, on the other hand, helps to form the lower part of the nasal septum, while the maxilla bone contributes to the overall structure of the upper jaw and helps to support the teeth and gums. Together, these deep facial bones play an essential role in maintaining the health and proper functioning of the oral and nasal cavities.

The deep facial bone that separates the oral and nasal cavities and forms the nasal septum is the "vomer" bone. The vomer is a thin, flat bone that is located in the midline of the skull and divides the nasal cavity into left and right halves. It plays an essential role in supporting the structure of the nasal cavity and contributing to the overall structure of the face.

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Anaerobic conditions would affect the rate of electron transport and ATP production during oxidative phosphorylation as follows:

Anaerobic respiration is the respiration that occurs in the absence of oxygen.

Anaerobic respiration occurs when oxygen is lacking or there is insufficient oxygen for the reaction of respiration to proceed to the last step of the transfer of electrons to oxygen.

Anaerobic respiration is also known as fermentation.

Anaerobic respiration that occurs in man results in the formation of lactic acid and is known as lactic acid fermentation.

Anaerobic respiration that occurs in microorganisms such as yeast results in the formation of ethanol and is known as ethanol fermentation.

Under anaerobic conditions, the pyruvate produced from glycolysis does proceed to oxidation to acetyl-CoA, the citric acid cycle, or the electron transport chain. Instead, the pyruvate is converted to lactic acid.

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The two conditions that must be met for a solar eclipse to occur are:

A solar eclipse is a celestial event that occurs when the Moon passes between the Sun and the Earth, blocking the Sun's rays and casting a shadow on a portion of the Earth's surface. During a total solar eclipse, the Moon completely covers the Sun, revealing the Sun's outer atmosphere, or corona, which is otherwise not visible.

During a solar eclipse, the Moon passes between the Sun and the Earth, blocking the Sun's rays from reaching a portion of the Earth's surface. This can only occur during a new moon, when the Moon is positioned between the Sun and Earth, and its shadow falls on the Earth's surface.

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Answer: B

Explanation:

The statement "It takes an average of eight minutes for any cell to complete the process" is NOT true of mitosis.

Mitosis is a process of cell division that allows a single cell to divide into two identical daughter cells, each with a full set of chromosomes. Mitosis is a vital process for growth, repair, and maintenance of multicellular organisms.

However, the time required for mitosis can vary depending on the cell type and the stage of development. Some cells can complete mitosis in minutes, while others may take hours or even days. Therefore, the statement "It takes an average of eight minutes for any cell to complete the process" is NOT true of mitosis, as the time required for mitosis can vary widely depending on the context.

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Answer:

Darwin's theory of evolution is when species are taking time to evolve from the original organism so in order for this to happen there has to be an original species so he also said that we came from apes if the world was 200 years old that still wouldn't be enough time for us to evolve how he said so in order for his theories to be even remotely  correct it took time for this to happen so the age of the earth in a way helps support his theory

Homeostasis control in living things is exerted over all of the following except response to stimuli. The correct answer is C.

Homeostasis is the ability of a living organism or cell to maintain a stable internal environment despite changes in external conditions. It involves the regulation of various physiological parameters, such as temperature, pH, fluid balance, moisture level, acidity level, and glucose levels, through feedback mechanisms that help to maintain a balanced and stable state.

This allows the organism or cell to function optimally and respond effectively to environmental challenges or changes. Homeostasis is essential for survival and is maintained by complex physiological and biochemical processes that work in harmony to keep the internal environment within a narrow range of acceptable levels.

However, the response to stimuli, such as sensory input from the environment, is not directly controlled by homeostatic mechanisms but by other physiological processes such as reflexes, sensory perception, and decision making in the brain.

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Answer:

Adjective

Explanation:

The worm is being described to be 2 centimeters long.

Yes, the animals living in the temperate forest have different adaptations for survival than the animals living in the desert.                                                                                                                                                                                                    

In the temperate forest, animals have to deal with changing seasons and the need to find shelter and food in a densely populated area. They have adapted to these challenges by developing camouflage, hibernation, and migration patterns. In contrast, animals in the desert must deal with extreme temperatures, scarce water resources, and limited food sources.These adaptations are specific to the environment that the animals live in, and allow them to thrive in their respective habitats.
They develop adaptations like nocturnal behavior, water conservation, and heat tolerance. The fennec fox, for instance, has large ears for heat dissipation and burrows to escape the daytime heat. Thus, these distinct ecosystems lead to unique survival strategies for their inhabitants.

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Answer:

The car appears to have a constant, positive acceleration for most of the video clip.

Explanation:

Answer from PLATO

Answer:

In this case, the population of moths you're referring to has a number of variations. Here they are:

1. Wing Color Variation: The moths have two phenotypic variations for wing color, brown and white. This is a clear physical trait that can change based on the genetic makeup of the moth.

2. Survival Variation: Out of every 100 eggs laid, only about 10 moths survive to adulthood. This could imply a variation in the fitness or adaptability of the offspring, where only the most fit or adaptable (in terms of avoiding predators, finding food, or handling environmental conditions, for example) survive.

3. Seasonal Environment Variation: The environment where the moths live changes with the seasons. In winter, the trees lose their leaves, which may affect the camouflage ability of the moths depending on their wing color. This is a temporal variation in the environment, which can potentially influence the survival rates of the different moth variations.

4. Predation Variation: The predators of the moths are birds, which hunt for the moths as they rest on the dark tree bark. The level of predation can vary based on factors like the bird population size, hunting efficiency, and the visibility of the moths.

Each of these variations plays a role in the survival and reproduction of the moths and could lead to evolutionary changes in the population over time, especially if certain traits (like wing color) increase the moths' survival and reproductive success.

The parts of the male structure of  flower have three parts stamen ,sepals and petals. Flowers are two types male flower and female flower . Two categories of flowers differ by bisexual (male flower + female flower) and asexual (male flower/female flower).

Male flower reproductive part is called stamen. Stamen having two parts anthor lobe (which is in the shape oval at the top) and filament (which supports anthor lobe having shape thin cylinder shape). Anther lobe having two pollen which is filled with pollen grains.  Sepals are outer part of the flower which supports the flower and petals are protect  reproductive parts of flower which is  spectacular  color.

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Answer:

The Answer is A

Explanation:

Explanation is the thermal heat energy from the outside is transferred by diffusion to the inside of the fridge applicably making the inside hotter and the outside colder in the immediate area.

Platyrrhines are the primates that belonging to the parvorder Platyrrhini. They are characterized by having prehensile tail a broad, and flat nose and with the sideways-facing nostrils. They have the prehensile tails, which are the long, grasping tails.

Despite its usefulness, the prehensile tail is also found only in the two groups of the primates: Cebus – the capuchin monkeys– and the atelines, a group that is includes the howler (Alouatta spp.) and the spider (Ateles spp.) the monkeys.

What primates have the prehensile tails?

The only primate the genera (Figure 1) that possess prehensile tails are the spider monkeys (Ateles), woolly spider and the monkeys (Brachyteles), howler monkeys (Alouatta), the woolly monkeys (Lagorix), and the capuchin monkeys (Cebus)

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The statement 'leafy sea dragons use their leaf-like projections to help them find food' is false.

Leafy sea dragons may have leaf-like protrusions, but they do not use them to find food. Instead, the leaf-like projections are used to camouflage them from predators. Hence, the statement above is false.

Leafy sea dragons blend in with the seaweed and other vegetation that surrounds them, making it difficult for predators to spot them.

Leafy sea dragons may look like they are using their leaf-like projections to find food, but in reality they are using their eyes and their ability to sense movements in the water. These projections are actually used to help them blend in with their environment and avoid predators.

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