The last major organ system to develop in the final 2 months of the fetal period is

a. the heart.
b. the lungs.
c. the kidneys.
d. the digestive system.

Answer: b. the lungs.

Psychology

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One purpose of the __________ is to speed up the neural message traveling down the axon

a) receptor site b) axon terminal c) myelin d) synaptic vesicle

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The stage of sleep in which delta waves begin to appear is __________ sleep

a) stage 1 b) stage 2 c) stage 3 d) stage 4

Psychology