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

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

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Protozon
Holozoic nutrition is characterized by

pinocytosis of solid nutrients and subsequent formation of phagocytic vacuoles
phagocytosis of soluble nutrients and subsequent formation of phagocytic vacuoles
phagocytosis of solid nutrients and subsequent formation of phagocytic vacuoles
photosynthesis

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