Extracellular digestion

• A. outside organism

• B. gastrovascular cavities

• C. alimentary canal

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Alimentary canal found in nematodes, annelids, molluscs, arthropods, echinoderms and chordates

Consists of a digestive tube with two openings mouth, anus

In contrast to gastrovascular cavity food moves in one direction

Features of alimentary canals

crops and gizzards - birds and annelids

gastric cecae- arthropods