How did mary leakey's discovery change the modern understanding of prehistoric humans? the bone she found provided evidence that early hominids made tools in east africa almost 2 million years ago. the remains she dug up at olduvai gorge proved homo erectus were the first to use tools. the artifacts she discovered offered evidence that early hominids lived in ethiopia about three million years ago. the skeleton she excavated proved that early hominids walked upright and were almost four feet tall.

The correct answer is D) The skeleton she excavated proved that early hominids walked upright and were almost four feet tall.

Mary Leakey's discovery changed the modern understanding of prehistoric humans in that "The skeleton she excavated proved that early hominids walked upright and were almost four feet tall."

Mary Leakey (1913-1996) was a British paleontologist and anthropologist dedicated to the excavation in archeological sites with his husband Louis. While working on Kenya, Africa, in October 1948, she discovered the skull of a proconsul Africanus. After examining it she concluded that it belonged to an ancestral species of human, the Australopithecus.  

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