First slide

Classification of Animals

Question

External fertilisation occurs in

Easy

A

sponges and coelenterates
B

flatworms and annelids
C

ctenophores and hemichordates
D

roundworms and molluscs

Solution

External fertilisation takes place in ctenophores and hemichordates.
Internal fertilisation takes place in sponges, flatworms and roundworms.

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