Differentiate complete and incomplete digestive system.

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S.No	Digestive System.	Incomplete Digestive System.
	Digestive system of Platyhelminthes has only a single opening to the exterior which serves as both mouth and anus, and hence called an incomplete digestive system	From Aschelminthes to Chordates, all animals have a complete digestive system with two openings, the mouth, and the anus.

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