Which shows the number of legs in each group of arthropods from least to greatest?

Insects have 6 legs, and arachnids have 8, so insects come first. Many familiar crustaceans, such as crabs, have 10 legs, while millipedes have many legs—usually more than the other groups. Thus the order from least to greatest is insects, arachnids, crustaceans, millipedes: choice D.

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