Longitudinal and circular muscles in the body wall help for locomotion in

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hookworm

cockroach

earthworm

jellyfish

answer is C.

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Detailed Solution

Annelids possess longitudinal and circular muscles in their body wall, which help in locomotion.
Cnidarians (e.g., jellyfish) lack muscles (they lack mesoderm).
In Aschelminthes (e.g., hookworm), only longitudinal muscles are present in the body wall.
The body wall of cockroach lacks muscles.

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