Q. Arms are absent in
A) Sea urchin
B) Sea cucumber
C) Both (a) and (b)
D) None of these
Explanation
Arms are absent in the class-Echinoidea (e.g., sea urchins and sand dollars) and holothuroidea (e.g., sea cucumbers).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.