When you get a vaccine it injects a controlled amount of the illness into you, so the immune system can build up an immunity. The memory cells come into play when the illness comes back.
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Answer:
C<em>?</em>
Explanation:
The preoperational stage is the second stage in Piaget's theory of cognitive development. This stage begins around age two and lasts until approximately age seven. During this period, children are thinking at a symbolic level but are not yet using cognitive operations.
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No, it does not affect the work of health scientists.
Hypertrophy is the answer because that’s what makes muscles grow
