Answer:
(i) Most
of them are small cylindrical or round worms. So they are also called round
worms.
(ii) The body size ranges from microscopic to a few centimetres in
length.
(iii) They all are mainly heterotrophic animals.
(iv) They are triploblastic.
(v) Body cavity has a true coelom.
(vi) Respiratory and circulatory systems are absent.
(vii) They have a complete alimentary canal.
(viii) Sexes are separate.
Examples are: Ascaris (roundworm), Enterobius, and Wuchereria
(filarial worm).
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