Gastrovascular Cavity versus Alimentary Canal
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
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.
Show
A jellyfish digests through a gastrovascular cavity; an earthworm's food travels one direction through a complete canal.
Watch for
A one-opening system cannot process incoming and outgoing material at once — a two-opening canal allows continuous feeding.