HIV directly attacks CD4 helper lymphocytes directly. (D)
In the _PNS_, the cells responsible for insulating neurons with myelin are called _Schwann cells_, whereas in the _CNS_, the cells responsible for insulating neurons are called _Oligodendrocytes_.
By primary succesion. Which is when new substrate is deposited.
Answer:
Stimulus is the cause or change in an organism's surroundings that causes it to response .. response is the result of the stimulus on the organism.
Explanation:
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