Question

how does the contractile vacuole in a single - celled organism function to maintain homeostasis? it pumps water into the cell. it pumps water out of the cell. it pumps solutes into the cell. it pumps solutes out of the cell.

Explanation:

The contractile vacuole in single - celled organisms expels excess water to maintain a proper internal water balance, which is crucial for homeostasis. It does not pump solutes in or out, and pumping water into the cell would disrupt homeostasis in a hypertonic environment.

Answer:

It pumps water out of the cell.