Is autotomy a structural or behavioral adaptation?

They're not. Behavioural Adaptation are adaptations like male peacocks spread their wings when they are attracting a mate. Structural Adaptations are like polar bears have webbed feet so it allows...

owls have feet

Structurally, their wings have evolved to flippers. This trades the behaviour of flying for swimming. Also, they survive cold climates by clustering together in groups to share body heat and minimize...

vertebrate.* its legs make it run fast..* its growl to keep other males away from its own cubs and lionesses.

a structural adaptation of plants is bark it helps limit he moisture evaporated from the tree trunk.