Which of the following characteristic distinguish arthropoda from annelids and molluscs?

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An external skeleton made of chitin (a polysaccharide) and protein rather than a shell made chiefly of mineral salts.

Subdivision of the legs into movable segments.

Distinct group of muscles, derived from many body segments, that move the separate parts of the exoskeleton.

All of the above

answer is D.

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Detailed Solution

An arthropod has a segmented body covered by an exoskeleton made from chitin and other chemicals.

This exoskeleton serves as protection and provides places for muscle attachment.

Arthropods must moult because their exoskeletons do not grow with them.

The body feature from which the phylum takes its name is the jointed appendages, which include antennae and mouthparts as well as walking legs.

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