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The animals with bilateral symmetry in young stage, and radial pentamerous symmetry in the adult stage, belong to the phylum

1. Annelida
2. Mollusca
3. Cnidaria
4. Echinodermata

Correct answer: Echinodermata

Solution

Echinoderms have bilateral symmetry in their larval stage, but as adults they develop radial pentamerous symmetry. This life-cycle shift is a defining feature of the phylum Echinodermata.

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