Which of the following character marks the difference between arthropods and annelids?

Segmented body

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Absence of nephridia

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Eyes

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Exoskeleton of chitin

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Solution

The correct option is A Exoskeleton of chitin
Annelids are worms which do not have an exoskeleton. The body of the arthropods is covered with a tough and resilient integument called as an exoskeleton. The arthropods have an exoskeleton which is hard and strong. The exoskeleton is made up of chitin. At the thickened areas, the chitin is reinforced with certain minerals and hardened proteins. So, the correct answer is option D.

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