Helper T cells <span>are required for almost all </span>adaptive immune responses<span>. They not only help activate B </span>cells to<span> secrete antibodies and macrophages </span>to<span> destroy ingested microbes, but they also help activate cytotoxic </span>T cells to<span> kill infected target </span>cells<span>.</span>
<span>Desirable traits become more common in populations because of the process of natural selection.</span>
One from each parents and organism donate only one copy of each gene in their gametes. Thus, they segregate , separate, during gamete formation.
Answer:
True
Explanation:
Hormonal shifts can be a cause for mood swings, <em>during teenage years the teens will experiment the production of estrogen (girls) and testosterone (boys) that will cause physical and emotional changes,</em> as the time pass by these mood swing normally become less common as hormones reach an equilibrium.
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