Final answer:
The positioning of the thumbs, known as opposable thumbs, is crucial for humans and African apes. It allows for effective manipulation of objects, enhanced tool use for humans, and improved climbing and handling abilities for apes.
Step-by-step explanation:
The positioning of the thumbs, or opposable thumbs, is particularly important for both humans and African apes. This distinctive attribute enables humans and apes to effectively grasp and manipulate objects. In humans, the thumb contrasts with the other four digits of the hand such that it can move to touch each of the other fingers. This enhances human capabilities related to tool use, writing, and many specialized tasks.
For African apes, including chimpanzees and gorillas, opposable thumbs provide an advantage for climbing trees and handling food or other objects. Like humans, these apes utilize a 'precision grip' when holding items between thumb and fingers, offering enhanced manipulation and control.
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