Discussion
The animals belonging to which one of the following phyla are characterized by "segmented body" ?
Answer: A
The segmented phylum is Annelida.
Annelids, the segmented worms such as earthworms, leeches and polychaetes, show true metameric segmentation: the body is a series of repeated segments, each with its own coelomic compartment, muscles, nerve ganglia, excretory nephridia and often bristles (chaetae).
Cnidarians (jellyfish, Hydra) are radially symmetric with a simple sac-like body. Echinoderms are pentaradial as adults and unsegmented. Sponges (Porifera) have no true tissues or organs, let alone segments.
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