Question Detail
Question
20. Echinoderm larvae exhibit which type of symmetry, leading to their classification as bilaterally symmetrical animals?
Correct Answer
Option B is the correct answer.
Detailed Explanation
Echinoderms (like sea stars) have radially symmetrical adults, but their larval stage exhibits bilateral symmetry, revealing their Bilaterian ancestry.
Hint
Starfish larvae are bilateral before undergoing metamorphosis into radial adults.