An axon is stimulated by a threshold stimulus and then by a stimulus three times as strong as the first. the resulting impulse in the latter instance will have:

A complete response

Explanation:

This follows the all-or-none principle, which states that the strength of the response of a nerve or muscle fiber does not depend on the strength of the stimulus acted upon it. If the stimulus is more that a certain threshold, the impulse will have a complete response, or otherwise none at all.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

the correct answer is b