Protozon
Protozoa have several types of vacuoles.The function of a contractile vacuole is to

contain specific enzymes that perform various functions
creates sites of food digestion
have sites for photosynthesis
maintain osmotic balance by continuous water expulsion

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Protozon
A protozoan is defined as

motile eukaryotic unicellular photosynthetic protist
motile eukaryotic unicellular protist
motile prokaryotic unicellular protist
motile eukaryotic multicellular protist

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