What is the most significant feature of insects that involves movement?

Insects are characterized by their unique anatomical features that enable various forms of movement, with jointed legs being particularly significant. The pairs of jointed legs are critical for locomotion, allowing insects to walk, run, jump, or climb. This adaptability in movement aids them in searching for food, escaping from predators, and navigating their environment. The jointed structure provides greater flexibility and range of motion compared to unjointed appendages, which enhances their ability to maneuver effectively in diverse habitats.

While other features such as wings facilitate flying and antennae assist with sensory perception, it is the jointed legs that fundamentally support movement and the insect's ability to interact with its surroundings in a physical manner. This capability to move efficiently is vital for an insect's survival and reproductive success.