Biology

The correct answer is: B.It pumps water out of the cell.

Explanation:

1.The contractile vacuole in single-celled organisms (such as paramecia or amoebas) functions primarily to regulate the amount of water within the cell. These organisms often live in freshwater environments where water constantly enters the cell due to osmosis (since the external environment is less concentrated in solutes than the interior of the cell).

2.The contractile vacuole collects excess water from the cytoplasm and then contracts, expelling the water out of the cell. This process helps to maintain osmotic balance, preventing the cell from swelling and potentially bursting due to excess water.

...