First slide

Classification of Animals

Question

The members of which of the following phyla exhibit only intracellular digestion?

Easy

A

Cnidaria
B

Ctenophora
C

Annelida
D

Porifera

Solution

Digestion is intracellular in sponges.
Digestion is both intracellular and extracellular Cnidaria and Ctenophora.
Extracellular digestion occurs in Annelida.

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