Adaptive immunity is based upon the interactions between specific immune system cells and a specific antigen. This happens when cell surface of B cell binds to antigen thus lead to activating B cells. Hope this is the answer and this would help.
Answer:
because ots diffwrent feom the others, cause of the cells roles ir has to play.
Answer:
A. The cells of unicellular organisms divide to reproduce; those of multicellular
organisms divide to replace cells and to grow
Explanation:
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