Answer,
The skeleton she found provided evidence that early hominids made tools in East Africa 2 million years ago.
Explanation,
Mary Leakey discovered the oldest human remains and ancient stone tools which offered insight into the minds of those who made them.Her discovery changed the human understanding with the bone she discovered inOlduvai Gorge East Afica.she uncovered the fossils of ancient hominids and classified the stone tools she found.She found out that the hominids were upright walkers.