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10 cards from this deck
Single opening for both food intake and waste removal
Two openings: mouth for food, anus for waste
Animals without a true body cavity
Animals with a true body cavity (coelom)
Animals with a false body cavity (pseudocoel)
Simple digestive chamber in single-opening systems
Allows continuous feeding and digestive specialisation
Roundworms (nematodes)
Wave-like muscular contractions that push food through gut
Animal must be triploblastic (have three germ layers)
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