Which characteristic is typical of insects (Class Insecta)?

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Multiple Choice

Which characteristic is typical of insects (Class Insecta)?

Insects are hexapods, meaning they have six legs arranged as three pairs on the thorax. This three-pair leg arrangement is a defining feature that sets insects apart from other arthropods—spiders have eight legs, while centipedes and millipedes have many legs. Antennae in insects are typically one pair, not two, so having two pairs of antennae doesn’t fit. Lack of wings isn’t universal—some insects have wings, some don’t—so that isn’t a reliable universal trait either. And insects do have distinct body regions: head, thorax, and abdomen. So the characteristic that best fits insects is three pairs of legs.

Insects are hexapods, meaning they have six legs arranged as three pairs on the thorax. This three-pair leg arrangement is a defining feature that sets insects apart from other arthropods—spiders have eight legs, while centipedes and millipedes have many legs. Antennae in insects are typically one pair, not two, so having two pairs of antennae doesn’t fit. Lack of wings isn’t universal—some insects have wings, some don’t—so that isn’t a reliable universal trait either. And insects do have distinct body regions: head, thorax, and abdomen. So the characteristic that best fits insects is three pairs of legs.

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