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Tems11 [23]
2 years ago
8

Why are there usually few organisms at the top of an energy pyramid?

Biology
1 answer:
anzhelika [568]2 years ago
4 0

Answer:

Explanation:

The number of organisms near the top of the energy pyramid is usually small, because most of the energy produced is lost due to factors such as exercise and heat. This energy loss occurs multiple times when passing through the pyramid, forcing consumers near the top to require more food. This creates a pyramid with the third consumer at the top and the producer at the bottom.

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What are the reasons for the several day delay in a primary response. Infection______. A. transport to secondary lymphoid tissue
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Answer:

The correct answer is D. proliferation and differentiation.

Explanation:

Primary immune response occurs due to the first exposure of an antigen to the immune system. The primary immune response is generally delayed by many days because it takes time for B and T cells to become cloned and to proliferate and differentiate.

Then after several days of proliferation and differentiation of activated T and B cells, T cells become effector T cells and B cell becomes plasma cells which then eliminates the antigen. Memory B and T cells are also produced during this process which helps in generating a quick immune response during the second and subsequent exposure of that antigen.

So the correct answer is D. proliferation and differentiation.

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6 0
2 years ago
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6 0
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The fingers are
andreev551 [17]

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8 0
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