What are the three parts of an insect's body?

• A. The head, thorax, and abdomen
• B. The wings, legs, and antennae
• C. The brain, heart, and stomach
• D. The exoskeleton, muscles, and nerves

Answer: (A)

Insects have three major body regions that form their basic body plan: the head, the thorax, and the abdomen. This division is the fundamental way we describe insect anatomy. The head houses sensory organs and mouthparts used for feeding and interacting with the environment. The thorax is the locomotion center, bearing the legs (three pairs) and, when present, the wings. The abdomen contains most of the digestive and reproductive organs and is often divided into many segments.

The other options describe specific parts or features, not the overall body divisions. Wings, legs, and antennae are appendages attached to the body segments. The brain, heart, and stomach are individual organs, not the three primary body regions. The exoskeleton, muscles, and nerves are tissue and organ-system components, not the three main body sections.