Which of these distinctively human characteristics was the first to appear in early hominids?

Question

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The ability to walk upright is considered the first distinctively human characteristic to appear in early hominids. This adaptation, known as bipedalism, is seen as a fundamental shift that preceded other human traits such as the development of a large brain, the use of language, and the evolution of the human hand with opposable thumbs.

Which of These Distinctively Human Characteristics Was the First to Appear