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Jet001 [13]
3 years ago
6

Do penguins have thick skin

Biology
1 answer:
Anika [276]3 years ago
4 0

Answer:

yes

Explanation:

it has 2 layers, one fat layer and the other is a feather layer to stay warm

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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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