A loud sound can be distinguished from a soft
whisper because
a. more neurons depolarize.
b. each receptor depolarizes more fully.
c. the frequency of neuron depolarization
increases.
d. more neurons depolarize, and the frequency of
neuron depolarization increases.
e. more neurons depolarize, each receptor
depolarizes more fully, and the frequency of
neuron depolarization increases.
Answer: d
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