Which of the Following Combinations Correctly Matches a Phylum to Its

Question

Which of the following combinations correctly matches a phylum to its description?
A)Echinodermata - bilateral symmetry as a larva, water vascular system
B)Nematoda - segmented worms, closed circulatory system
C)Cnidaria - flatworms, gastrovascular cavity, acoelomate
D)Platyhelminthes - radial symmetry, polyp and medusa body forms

Accepted Answer

Echinodermata are characterized by their bilateral symmetry as a larva and possession of a water vascular system, which helps them in movement and feeding. Nematoda are roundworms and are not segmented, and do not possess a closed circulatory system. Cnidaria are characterized by their presence of a gastrovascular cavity and radial symmetry, and are not flatworms or acoelomate. Platyhelminthes are characterized by their presence of a flattened body, but they exhibit bilateral symmetry and do not have polyp and medusa body forms.