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 stable internal environment (homeostasis). It is mainly involved in osmoregulation by removing water that enters the cell due to osmosis.

Answer:

It pumps water out of the cell.