What term describes the adaptation of living in trees?

The term that describes the adaptation of living in trees is "arboreal." This word specifically refers to animals or organisms that are adapted to life in the trees, which includes features such as strong limbs for climbing, a lightweight body structure, and often adaptations for grasping branches. Arboreal animals have evolved behaviors and physical traits that allow them to navigate the three-dimensional environment of trees effectively, accessing food sources and avoiding ground-based predators.

The other terms, while related to different habitats, do not accurately describe life in trees. "Terrestrial" pertains to living primarily on land, "aquatic" pertains to life in water, and "subterranean" refers to an underground lifestyle. Each of these terms highlights adaptations linked to their respective environments but does not encompass the specific adaptations associated with tree-dwelling organisms.