During development, the nervous system is sculpted through which of the following?
A. Neuronal death
B. Neuronal activity
C. Axon retraction
D. All of the above
ANS: D
Rationale: As many as one-half of the neurons formed during development do not survive, which is likely the result of inactivity or a failure to reach a target cell. In some cases, neurons that survive will retract axons from certain target cells.
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