Common structure between earthworm and cockroach is

Cocoon

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Ommatidia

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Dorsal nerve cord

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Ventral nerve cord

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Solution

The correct option is D Ventral nerve cord
Earthworms form cocoon but cockroach does not form a cocoon in its life cycle.
The cockroach has a compound eye comprised of a number of ommatidia, but earthworm does not have eyes.
Both earthworms and cockroaches are invertebrates having a ventral solid nerve cord.

So, the correct answer is option D.

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