First slide
Classification of Animals
Question

Internal fertilisation occurs in which of the following animals?

Moderate
Solution

Fertilisation in sponges (e.g., Spongilla) is internal. External fertilisation occurs in ctenophores (e.g., Pleurobrachia), echinoderms (e.g., Asterias) and hemichordates (e.g., Saccoglossus).

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