Answer :
Final answer:
The key physical difference between humans and apes is the larger size and complexity of the human brain. It supports our superior cognitive skills compared to apes, including reasoning, language use, and problem-solving.
Explanation:
The most crucial physical differentiation between humans and apes centers around the superior size and complexity of the human brain. This presents the correct choice (C) from the provided options: (A) knee, (B) jaw, (C) brain, and (D) ear. The human brain is not only larger than that of apes in proportion to body size, but it also exhibits a more complex structure that enables advanced cognitive abilities such as reasoning, abstract thinking, language use, and problem-solving. While apes are intelligent and capable of learning and performing various tasks, their brain capacity and functionality do not reach the sophistication of human cognitive abilities.
Learn more about human brain difference here:
https://brainly.com/question/30800323
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