Which of the following is NOT a body region of an insect?

Insects are characterized by three primary body regions: the head, thorax, and abdomen. The head contains sensory organs and mouthparts, the thorax is responsible for locomotion and typically houses the legs and wings, while the abdomen contains vital organs related to digestion and reproduction.

Legs, while essential for movement, are not classified as a separate body region. Instead, they are appendages that are attached to the thorax. Each body region serves distinct functions critical to the insect's survival, but legs themselves do not qualify as a structural body region. Understanding this classification helps in recognizing the anatomy and functional adaptations of insects.