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Cells in the sponge walls filter nutrients from the water as the water is carried through the body. The flow of water through the sponge is unidirectional, driven by beating of flagella.
Examples: Glass Sponges and Calcareous Sponges.
Picture:
Cnidarians: These are radially symmetrical. The mouth, located at the center of one end of the body, opens into a gastro vascular cavity, which is used for digestion and distribution of food. Cnidarians have a body wall composed of three layers: an outer epidermis, an inner gastro dermis, and a middle mesogloea.
Examples: Sea Anemones and Corals.
Picture:
Echinoderms: Most species reproduce sexually, and species have separate sexes...
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