Answer :
Final answer:
The earliest evidence of bipedalism, around 3.5 million years ago, was discovered by Mary Leakey in East Africa, showcasing key evolution traits in hominids.
Explanation:
The earliest evidence of bipedalism in the fossil record dates back to approximately 3.5 million years ago (mya), as seen in the footprints discovered by Mary Leakey in East Africa at Laetoli.
This evidence suggests that the bipedal individuals were most likely Australopithecus afarensis, showcasing a modern striding gait.
Bipedalism, a key trait in human evolution, allowed hominids to use their hands for tool development and contributed to their transition from forest-dwellers to more open savanna environments.
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