Answer:

Darwin speculated in his 1871 book The Descent of Man that Africa was the cradle of humans because our two closest living relatives—chimps and gorillas—lived there.

Explanation:

Africa is known as the Cradle of Humankind because it is where human life began. The name refers to a region in South Africa where fossil remains of several human ancestors have been discovered. The oldest evidence dates back at least three million years.