Question

Single opening of alimentary canal is fou nd in 1. Platyhelminthes 2. Annelida 3. Sponges. 4.all

Answer 1

Sponges...............

Answer 2

Answer:

platyhelminthes

Explanation:

This is because it only has one opening for it's digestive system which is also used for it's mouth but not anus making their digestive tract incomplete

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