Which of the following best describes the structural features of insects?

The structural features of insects are best described as consisting of three distinct regions: the head, thorax, and abdomen. This tripartite body plan is a fundamental characteristic of insects, distinguishing them from other arthropods.

The head houses important structures such as the eyes, mouthparts, and antennae, which are essential for sensory perception and feeding. The thorax is the section responsible for movement and locomotion, as it typically bears the legs and, in the case of many insects, the wings. The abdomen contains vital organs related to digestion, reproduction, and excretion.

While the other choices may include elements that apply to certain insects (such as wings or legs), they do not accurately encapsulate the primary structural layout of all insects. The correct statement focuses on the foundational segments that universally define the anatomical structure across the vast diversity of insect species.