All insects have ___ body segments, __ pair of antennae, and ___ pairs of legs.

All insects have ___ body segments, __ pair of antennae, and ___ pairs of legs.

• A. Three segments; one pair of antennae; three pairs of legs
• B. Two segments; two pairs of antennae; four pairs of legs
• C. Three segments; one pair of antennae; two pairs of legs
• D. Four segments; one pair of antennae; two pairs of legs

Answer: (C)

Insects share a distinct body plan: three main body segments—head, thorax, and abdomen; one pair of antennae on the head; and three pairs of legs on the thorax. This combination is what defines their anatomy, with the legs count totaling six. So the description that matches this is three body segments, one pair of antennae, and three pairs of legs. The other descriptions mix up either the number of segments, the number of antennae, or the number of legs, which doesn’t fit how insects are built.

Insects share a distinct body plan: three main body segments—head, thorax, and abdomen; one pair of antennae on the head; and three pairs of legs on the thorax. This combination is what defines their anatomy, with the legs count totaling six. So the description that matches this is three body segments, one pair of antennae, and three pairs of legs. The other descriptions mix up either the number of segments, the number of antennae, or the number of legs, which doesn’t fit how insects are built.