In museum study, an adult sea star has body parts arranged around five radiating arms. The specimen or feature is best linked with:

Correct Answer: C

pentaradial adult symmetry

Adult echinoderms usually show pentaradial symmetry, commonly arranged in five parts. Their larvae, however, are bilaterally symmetrical. This MCQ belongs to the Echinodermata topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.