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1.C
4.B
8. A
12.A
The answer is d is environmental <span />
Answer:
Explanation:
B cells produce and secrete antibodies, activating the immune system to destroy the pathogens. The main difference between T cells and B cells is that T cells can only recognize viral antigens outside the infected cells whereas B cells can recognize the surface antigens of bacteria and viruses
Answer:
Critical Period.
Explanation:
A critical period is a maturational stage in the lifespan of an organism during which the nervous system is especially sensitive to certain environmental stimuli, such as light.
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