In recent decades, scientists working in eastern Africa have made numerous discoveries. One important site is Olduvai Gorge in Tanzania, where scientists found:
A) The first complete pterodactyl skeleton B) Stone tools similar to those used by North American natives C) Proto-human fossils ü D) A buried city, almost perfectly preserved
Much of the work at Olduvai was carried out by expeditions led by the American scientist Louis Leakey, whose discoveries there in the early 1960s included Homo habilis, a tool-user dating back nearly two million years.
