Question

according to currently accepted theories on human evolution, human ancestors developed an opposable thumb which led to the manufacture and use change most likely facilitated tool making in early humans? a decrease in jaw size an increase in body size a switch to animal - based nutrition a shift towards bipedal locomotion

Explanation:

To determine the factor that facilitated tool - making in early humans, we analyze each option:

• A decrease in jaw size is related to changes in diet and dental structure, not directly to tool - making.
• An increase in body size does not have a direct connection to the ability to make tools.
• A switch to animal - based nutrition is about dietary changes and not related to the physical adaptations for tool - making.
• A shift towards bipedal locomotion freed the hands. When early humans started walking on two legs (bipedalism), their hands were no longer needed for locomotion. This freed - up hands could then be used for tasks like manipulating objects, which was a crucial step in the development of tool - making. So, a shift towards bipedal locomotion is the factor that most likely facilitated tool - making.

Answer:

D. a shift towards bipedal locomotion