Differentiation in segmental fashion occurs in
(a) Leech
(b) Starfish
(c) Snails
(d) Ascaris
The answer is (a) Leech
Leech is a member of the Annelida phylum. Their body surface is divided into segments that are identical to each other and they contain a set of organs in each segment. Their body is also covered with cuticles. Starfish are members of the phylum Echinodermata. Snails belong to the phylum Mollusca, which lacks true segmentation. Ascaris is a genus of roundworms in the phylum Nematoda. Nematodes are unsegmented worms.