Question

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taste and smell are unique among the senses because their receptor cells ____.
regenerate regularly
are similar in sensitivity to those of other mammals
are electrical rather than chemical
do not deteriorate with age

Explanation:

Taste and smell receptor cells are unique as they regenerate regularly. Other senses' receptor cells generally do not have this characteristic. Sensitivity can vary among species for smell and taste. Receptor cells for taste and smell are chemical - not electrical. And they do deteriorate with age.

Answer:

A. regenerate regularly