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1.The most primitive members of the animal kingdom are the a.worms b.cnidarians c.sponges d.mollusks 4.Match the sponge cell type to its function/description. a.covers the outer surface of the body b.uses flagella to move water through the sponge body c.secretes spicules d.creates the hole that water passes through to enter the channels. 1.porocyte 2.epidermal cell 3.collar cell 4.amoebocyte