A group of cells that works together may form

 Tissue

A group of cells that work together form a tissue. Your body has four main types of tissues, as do the bodies of other animals. These tissues make up all structures and contents of your body

Explanation:

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answer is they may form a tissue.

and after water is usually warmed by the sun the water temperature raises and then evaporates .

voluntary muscles are controlled by the cerebellum.