Final answer:
The characteristics of extended ontogeny, stereoscopic vision, and hands with opposable thumbs are indeed true for primates, supporting their adaptation for an arboreal lifestyle and other evolutionary traits.
Step-by-step explanation:
The statement that the following characteristics are commonly found among primates: extended ontogeny, stereoscopic vision, and grasping hands with opposable thumbs is true. Primates, including humans, have distinctive features attributable to their arboreal ancestry. These features encompass hands and feet specialized for brachiation, or tree swinging, and climbing. Traits such as a rotating shoulder joint, widely separated big toe and thumbs for robust branch gripping (except in humans), as well as stereoscopic vision for depth perception, are common among primates. Additionally, primates possess enlarged brains relative to body size, nails instead of claws, typically bear one offspring at a time, and have a tendency toward an upright body posture.