Answer:
(i)
Body is bilaterally symmetrical.
(ii) They are triploblastic.
(iii) Metameric segmentation is present.
(iv) Closed circulatory system with respiratory pigment
dissolved in the plasma.
(v) Nephridia for excretion and osmoregulation are
present.
(vi) These animals are found in a variety of habitats like
fresh water, marine water as well as on land.
Examples are: Nereis (sand worm or clam worm). Aphrodite
(sea mouse), Pheretima (earthworm).
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