Final answer:
Grasping hands and stereoscopic vision in primates can be explained by adaptations for climbing trees and visual predation.
Step-by-step explanation:
The presence of grasping hands and stereoscopic vision in primates can be explained by a combination of adaptations for climbing trees and visual predation.
- Primates have hands and feet adapted for climbing, with thumbs and big toes that are widely separated from the other digits for gripping branches.
- Stereoscopic vision, or two overlapping fields of vision, allows for depth perception and gauging distance, which is important for navigating tree branches.
These traits, along with others such as larger brains and modified claws, have evolved to help primates thrive in their arboreal environment.