Which term defines an arthropod with three body parts, typically with one pair of antennae, two pairs of wings, and three pairs of legs on the thorax?

Which term defines an arthropod with three body parts, typically with one pair of antennae, two pairs of wings, and three pairs of legs on the thorax?

• A. Insect
• B. Arachnid
• C. Crustacean
• D. Myriapod

Answer: (A)

Insects are defined by a three-part body plan (head, thorax, abdomen), one pair of antennae, typically two pairs of wings, and three pairs of legs on the thorax. This combination of features is the hallmark that separates insects from other arthropod groups. Arachnids have two body regions and eight legs with no wings and no antennae; crustaceans usually have multiple pairs of antennae and a variety of appendages and often live in aquatic environments; myriapods have many body segments with one or two legs per segment and also lack wings.

Insects are defined by a three-part body plan (head, thorax, abdomen), one pair of antennae, typically two pairs of wings, and three pairs of legs on the thorax. This combination of features is the hallmark that separates insects from other arthropod groups. Arachnids have two body regions and eight legs with no wings and no antennae; crustaceans usually have multiple pairs of antennae and a variety of appendages and often live in aquatic environments; myriapods have many body segments with one or two legs per segment and also lack wings.