A shark's sharp teeth are an example of an

vibrates

Explanation:

Because The rows of teeth that sharks have are referred to as an adaptation. Adaptations are characteristics that organisms acquire over time in order to facilitate their survival in their environment. Another example of adaptation which is found in humans is the variance in skin color. A darker skin color prevents damage to the skin in hotter environments.

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Explanation:

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.