All living creatures have some form of sleep that they engage in at regular periods, making sleep a(n) function. a. environmental b. biological c. species-specific d. psychological

   B. Biological

Explanation:  Sleeping is a biological function that all living beings have, and sleeping is important for people to preserve mental and physical health. It is especially important for children, because during sleep, actions that take place are important for the normal functioning of the brain. During sleep, different types of toxins in the brain harvested during the day are cleared.

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answer; /// i do believe its the ; //(iroquois)they were made up of several groups who spoke a common language;

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