D- Park Clean-ups is the correct answer to this question.
thymus plays important role by development of a normal, healthy immune system. thymus function is to generate mature lymphocytes
In other words, white blood cells that help fight of illness in the immune system.
sorry if I am wrong.
That a person is heterozygous for a certain trait. Rr=heterozygous and RR= homozygous. You can remember this because Hetero= different and homo= same
Explanation:
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