Biology / Bio 2765 · Atom · ~20 seconds
Gastrovascular Cavity versus Alimentary Canal
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A gastrovascular cavity is a blind pouch with one opening serving as both mouth and anus; an alimentary canal is a tube with separate ends.
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A jellyfish digests through a gastrovascular cavity; an earthworm's food travels one direction through a complete canal.
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A one-opening system cannot process incoming and outgoing material at once — a two-opening canal allows continuous feeding.