The two traits that all primates share for navigating life in trees are Grasping hands and binocular, stereoscopic vision. Thus, option d is correct.
The binocular vision that only primates persist is the having forward-facing eyes giving wider field vision. Such vision is for enhanced depth perception. Grasping of hands/feet in all primates persists except for humans. The grasping hand's feature is for an adaptation of life on the trees. Such hands show a pentadactyl pattern.
Stereoscopic visuals are the ability of the visual brain to register a sense of three-dimensional shape and form from visual inputs. Thus, human i capable of remarkably precise judgments in discriminating disparities as small as a 2-second of arc.
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