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
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Explanation:

Taste and smell receptor cells are unique in that they can regenerate regularly. This is not a common feature among other sensory - receptor cells. Other mammals' sensitivity levels vary greatly, and taste/smell receptors are chemical, not electrical. Also, they do deteriorate with age.

Answer:

A. regenerate regularly