Which of the following adaptations is NOT typically associated with primate evolution?

The adaptation that is not typically associated with primate evolution is the lack of opposable thumbs. Primates are characterized by their ability to manipulate their environment using highly flexible digits, which include opposable thumbs, an adaptation that aids in grasping and handling objects, climbing, and foraging.

Primates usually exhibit a range of unique adaptations that enhance their survival and functional capabilities in diverse environments. For instance, convergent eye orbits allow for better binocular vision, which is crucial for depth perception and navigating complex arboreal habitats. The presence of a postorbital bar provides structural support for the eye region, which is advantageous for protecting the eyes and enhancing visual acuity.

Highly specialized teeth are another feature often linked to primate evolution, reflecting their varied diets that can include fruits, leaves, and insects. This specialization enables primates to adapt to different ecological niches.

Overall, the absence of opposable thumbs contradicts a fundamental characteristic of most primates, emphasizing their evolved traits that focus on manipulation and dexterity.