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

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

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Protozon
Holozoic nutrition is characterized by

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

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