Apeacock spreading its tail to attract a mate is sending a(n) stimulus.
external
learned
internal
innate

The correct answer is:

external

Explanation:

Physiology Something that can obtain or provoke a physiological answer in a cell, a tissue, or an organism. A stimulus can be internal or external. Sense organs, such as the ear, and sensory receptors, such as those in the skin, are receptive to outside stimuli such as noise and touch. A stimulus can be external, indicating it happens outside the organism.

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