Which of the following animals does not undergo metamorphosis?

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Mussel

Earthworm

Moth

Starfish

answer is B.

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Detailed Solution

The term "metamorphosis" refers to a change in an animal's form that occurs during normal development after the embryonic stage.

Animals that show indirect development i.e. have a larval stage in their life history undergo metamorphosis while those with direct development do not.

The earthworm, unlike the moth (insect), starfish (echinoderm), and mussel (mollusc), lacks a larval stage and thus, does not undergo metamorphosis during its life cycle.

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