Question Detail
Question
Which phylum exhibits radial symmetry as adults but bilateral symmetry in their larval stages?
Correct Answer
Option C is the correct answer.
Detailed Explanation
Under 'Phylum Echinodermata (Spiny Skins)', the text explicitly states: 'Symmetry: Adults radial (usually pentamerous), larvae bilateral - secondarily derived radial symmetry.'
Hint
Consider the symmetry patterns of starfish and sea urchins.