True coelom appeared first in the course of evolution in

roundworms

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chordates

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starfish

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leech

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Solution

The correct option is D leech
True coelom is found in leech and it is formed by splitting of mesoderm. True coelom appeared first in the course of evolution in animals belonging to phylum Annelida. Examples: Earthworm, leech, Nereis.
Roundworms are pseudocoelomates.
Starfish and chordates are coelomates and in the course of evolution, the coelom appeared after annelids.

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