Euglena green and Volvox are the simplest animals of the Flagellate type, because they move with the help of flagella (Euglena has one flagellum, each Volvox cell has two flagella). These are animals for which two types of nutrition are characteristic – photosynthesis in the light and the absorption of ready-made organic substances if there is no light. The main difference: Zvglena is a free-living organism, while Volvox is a colonial animal. In a colony, cells share their functions: some are responsible for nutrition, others for movement.
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