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

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

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Protozon
Saprozoic nutrition is characterized by

pinocytosis of solid nutrients and subsequent formation of phagocytic vacuoles
encystment of solid nutrients and subsequent formation of secretory vacuoles
phagocytosis of solid nutrients and subsequent formation of phagocytic vacuoles
pinocytosis of soluble nutrients and subsequent formation of phagocytic vacuoles

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