B cells make antibodies. That's just what they do.
2 is D. The flu virus constantly mutates, so a new vaccine every year is developed.
Antibodies attach to cells with the corresponding antigen. anti-anti, that's how i remember it.
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The answer is either the second sentence or the third, i believe it is the 3rd
Answer:
Punctuated equilibrium
Explanation:
The idea of "punctuated equilibrium" suggests that species will show little to no evolutionary change throughout their history. When evolution does occur, according to this idea, it happens sporadically and relatively quickly compared to the species' full duration on Earth.