In Protozoa like Amoeba and Paramecium, an organelle is found for osmoregulation which is

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Unicellilar organisms such as Anoeba, Paramecium use organelle called contractile vacuolefor excrtetion. These are fresh water living animals, ie, they are lived in hypotonic solution. There fore, water flows from outside to inside the body of the organism. The contractile vacuoles in these organisms collect this excess water and gradually increase in size. When the vacuoles reach a critical size they contract, squeezing out their contents through the process of simole diffusion.

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