Achange in facial expression, a pause, an altered vocal pitch or speaking rate, or a movement all may indicate a

Nonverbal transition

Explanation:

Nonverbal transition involves using nonverbal communication techniques to pass across a message effectively to an audience. They are often employed by people who engage in public speaking to ensure a good flow of conversation.  Nonverbal transition elements, such as a change I facial expression, a pause, an altered vocal pitch or speaking rate etc., are used alone or mixed together by a speaker to attract and sustain the interest and attention of the audience.

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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.