What identifies an ectoparasite as an arachnid?

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Multiple Choice

What identifies an ectoparasite as an arachnid?

Explanation:
Arachnids are defined by having two body regions and eight legs. For ectoparasites like ticks and mites, the key identifying feature is two body parts—the cephalothorax and abdomen—and four pairs of legs, giving eight legs in total. This distinguishes them from insects, which have three body parts and three pairs of legs. So the two-body-part, four-pairs-of-legs combination is the telltale trait of arachnids.

Arachnids are defined by having two body regions and eight legs. For ectoparasites like ticks and mites, the key identifying feature is two body parts—the cephalothorax and abdomen—and four pairs of legs, giving eight legs in total. This distinguishes them from insects, which have three body parts and three pairs of legs. So the two-body-part, four-pairs-of-legs combination is the telltale trait of arachnids.

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