What did the leakeys discover in Olduvai Gorge?

A: an early human settlement

B: Prehistoric tools

C:A complete human skeleton

D:Sets of neanderthal footprints

They found B. Prehistoric tools

It was a great discovery because it allowed people to recreate how tools had been used and crafted, finding gnawing marks on them and similar things that showed how the early hominids functioned. This proved to be one of the biggest findings in history of archaeology.