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Unformatted text preview: cilia to swim to a new spot to settle and develop into an adult. Ctenophore : (comb jellies) have a radially symmetrical, diploblastic body plan.-The two cell layers are separated by a thick, gelatinous mesoglea, and a complete gut.-Ctenes are comb-like rows or fused cilia; more through water by beating cilia.-All are marine and feed on small planktonic organisms. Simple life cycle fertilized egg develops into small ctenophores. Cnidarians: include jellyfish, sea anemones, coral, and hydrozoans.-The Cnidarian gut is a sac, the gastrovascular cavity. Functions in digestion, circulation, gas exchange, and as a hydrostatic skeleton. Biology Notes March 14, 2008 Three Life Cycles of a Cnidarian:-Sessile polyp stage.-Motile medusa stage: produces gametes.-Fertilized egg develops into a free swimming ciliated larva or planula, which settles and grew into a polyp....
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