Members of the phylum protozoa use the contractile vacuole

Members of the phylum Protozoa use the contractile vacuole to remove excess water. Protozoa are unicellular organisms that are found in various habitats such as freshwater, marine water, and soil. They need to maintain a balance of water and solutes in their cytoplasm to carry out various cellular functions. The contractile vacuole is a specialized organelle that helps in regulating this balance by collecting excess water and expelling it out of the cell through a pore. This helps in preventing the cell from bursting due to excess water intake, which is important for the survival of the organism.