What grounds can you say the Africa first continent were the earliest human form was developed?

What grounds can you say the Africa first continent were the earliest

1.	What grounds can you say the Africa first continent were the earliest human form was developed?
Answer» Beginning 135,000 years ago, tropical Africa experienced megadroughts which drove humans from the land and towards the sea shores, and forced them to cross over to other continents. ... Fossils of early Homo sapiens were found in Qafzeh and Es-Skhul Caves in Israel and have been dated 80,000 to 100,000 years ago.