Answer the following question given this paragraph: 

Organisms that live in a hypotonic environment such as freshwater, need a way to prevent their cells from taking in too much water by osmosis. A contractile vacuole is a type of vacuole that removes excess water from a cell. Freshwater protists, such as the paramecia shown in Figure below , have a contractile vacuole. The vacuole is surrounded by several canals, which absorb water by osmosis from the cytoplasm. After the canals fill with water, the water is pumped into the vacuole. When the vacuole is full, it pushes the water out of the cell through a pore. Other protists, such as members of the genus Amoeba , have contractile vacuoles that move to the surface of the cell when full and release the water into the environment.


Q: Organisms that live in freshwater environments often possess a contractile vacuole that prevents cells from taking in too much water through what process?

 Choices:

- electrolysis

- glycolysis

- hemostasis

- osmosis

A:
osmosis
