Question

Which organism possesses an anterior and a posterior contractile vacuole?

Answer 1

"A contractile is a sub-cellular structure involved in osmoregulation. It is found predominantly in protests and in unicellular algae. It was previously known as pulsatile or pulsating vacuole.

It is a specialized kind of vacuole that regulates the amount of water inside a cell. In clean water environments, the concentration of solutes is hypotonic, elevated inside than outside the cell.

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