Write an essay highlighting the reason why Africa has been labelled the cradle of humanity

The idea that humans evolved in Africa can be traced to Charles Darwin. In his 1871 book The Descent of Man, Darwin speculated that it was "probable" that Africa was the cradle of humans because our two closest living relatives-chimpanzees and gorillas-live there. However, he also noted, a large, extinct ape once lived in Europe millions of years ago, leaving plenty of time for our earliest ancestors to migrate to Africa. So, he concluded, "it's useless to speculate on the subject."