Pick out the correct statements pertaining to Annelida.
(a) Metameres are the true segments.
(b) Nereis is monoecious and Hirudinaria is dioecious.
(c) Muscles of body wall help in locomotion.
(d) They may be aquatic or terrestrial or avian.

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(a) and (d) are correct

(a) and (c) are correct

(a), (b) and (c) are correct

(a), (b) and (d) are correct

answer is C.

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Detailed Solution

Metameres are the true segments in annelids.

Nereis, an aquatic form, is dioecious, but earthworms and leeches (Hirudinaria) are monoecious.

Muscles of the body wall help in locomotion.

Annelids may be aquatic (marine and fresh water) or terrestrial; free-living, and sometimes parasitic.

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