While comparing invertebrate groups, a sea star can replace a damaged arm, and some species may regrow much of the body if part of the central disc remains. The feature being tested is:

Correct Answer: B

regeneration

Many echinoderms show strong regenerative ability. Sea stars can regenerate lost arms, although the extent depends on the species and whether enough central disc tissue remains. This MCQ belongs to the Echinodermata topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.