Which of the Following is Found Only Among Annelids

Question

Which of the following is found only among annelids?
A)a hydrostatic skeleton
B)segmentation
C)a clitellum
D)a closed circulatory system
E)a cuticle made of chitin

Accepted Answer

A clitellum is a feature unique to annelids, particularly within the subclasses Oligochaeta (which includes earthworms) and Hirudinea (leeches). It secretes a cocoon for the eggs, distinguishing these creatures from others listed.