Answer:
<h2>An activated B cell divides into cells that give rise to memory B cells and plasma cells.</h2>
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Answer:
Contact the Centers for Disease Control and Prevention (CDC).
Explanation:
(Assuming that this is about chromosomes)
A male has an XY combination in his chromosomes.
<span>Thymine is harder to make, but more stable. DNA needs to keep information safe for a long time, so it makes sense to use thymine. But RNA is made and used quickly, and small mistakes don’t matter as much, so the easier to make uracil does the job.</span>
