Final answer:
Humans moved out of Africa due to various reasons including climate change, following food sources as hunter-gatherers, overpopulation, and the spread of diseases like malaria.
Step-by-step explanation:
The explanations of wanderlust, following animal herds, and escaping mosquito-borne diseases are all offered to explain the movement of humans out of Africa. Several factors influenced these migrations, which started as early as 200,000 years ago. One major reason for this great exodus was the changing climate in Africa, which became drier, leading to a scarcity of resources. Another compelling reason was that our ancestors were hunter-gatherers; thus, they often followed the herds they hunted, which required mobility and could trigger mass movements. Additionally, with the advent of agriculture and raising livestock, the overpopulation in certain regions or the spread of diseases such as malaria also urged human populations to migrate to new lands.