First slide

Classification of Animals

Question

Digestion is both intracellular and extracellular in

Easy

A

Euspongia and Obelia
B

Sycon and Spongilla
C

Physalia and Pleurobrachia
D

Pheretima and Periplaneta

Solution

Digestion is both intracellular and extracellular in Cnidaria (e.g., Physalia) and Ctenophora (e.g., Pleurobrachia).
Only intracellular digestion occurs in sponges (e.g., Euspongia, Sycon and Spongilla).

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