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Multiple Choice

Which feature describes arachnids (spiders, scorpions)?

Arachnids are defined by having eight legs—four pairs—used for walking and capturing prey, which is a clear, distinguishing feature of spiders and scorpions. This sets them apart from insects, which usually have six legs and often antennae. They also wear two main body regions—the cephalothorax and abdomen—rather than a single body segment, and their development doesn’t involve the metamorphosis seen in some insect groups. So the feature that best describes arachnids is having four pairs of legs.

Arachnids are defined by having eight legs—four pairs—used for walking and capturing prey, which is a clear, distinguishing feature of spiders and scorpions. This sets them apart from insects, which usually have six legs and often antennae. They also wear two main body regions—the cephalothorax and abdomen—rather than a single body segment, and their development doesn’t involve the metamorphosis seen in some insect groups. So the feature that best describes arachnids is having four pairs of legs.