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.
B. Crab
is your answer
An crab has an exoskeleton
hope this helps
If the star is receding, the pattern moves to longer, redder wavelengths. This is called redshift. Edwin Hubble used the Doppler effect<span> to determine that the universe is expanding. ... This red shift indicates that stars are moving away from us and from each other.</span>
The physiology, behavior, and other qualities of a particular organism or class of organisms.
Answer;
A. People eating salmon
Explanation;
-All of the materials an organism takes in are
returned to the ecosystem, while the organism lives or after it dies.The movement of matter through the living and nonliving parts of
an ecosystem is a continuous process, a cycle.
-Matter in an ecosystem may
change form, but it never leaves the ecosystem, so the matter is said to
cycle through the ecosystem.
