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Question

What is common between an earthworm, a cockroach and a centipede?


A
Sexual dimorphism
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B
Metamorphism
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C
Chitinous exoskeleton
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D
Haemocoel
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Solution

The correct option is D Haemocoel
Centipede shows no sexual dimorphism and so do earthworms.
Centipedes and cockroaches undergo incomplete metamorphism.
Earthworms don't have a chitinous exoskeleton.
The only common thing between the cockroach, centipede, and earthworms is that they have hemocoel. Hemocoel is a cavity, between the organs of arthropods and molluscs, through which the blood circulates. The blood in the hemocoel is called hemolymph.
Therefore, the correct answer is option D.

Biology

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