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Complete Digestive System Incomplete Digestive system Gastrovascular Cavity Lack a digestive system body cells engulf...

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Biology

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Complete Digestive System Incomplete Digestive system Gastrovascular Cavity Lack a digestive system body cells engulf particles by phagocytosis Gills Lungs No specialized respiratory system gas exchange occurs across body wall Excretory Canals Kidneys No specialized excretory system excretion of wastes occurs at a cellular leve Nerve net Centralized brain and nerve cords No nervous system Support from microscopic spicules or collagen fibers Hard endoskeleton of bone or cartilage or calcium carbonate plates Hard exoskeleton rostatic

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