AP BIOLOGY

Detailed explanation-1: -Most likely, a change in climate helped to push them out. Experts suggest that droughts in Africa led to starvation, and humans were driven to near extinction before they ever had a chance to explore the world. A climate shift and greening in the Middle East probably helped to draw the first humans out of Africa.

Detailed explanation-2: -Those migrations were likely driven by climate, food availability, and other environmental factors. As time passed and cultures became less nomadic, war and colonialism began to fuel migrations, too. The ancient Greeks expanded their dynasty with a laundry list of colonies.

Detailed explanation-3: -If you picture early humans dining, you likely imagine them sitting down to a barbecue of mammoth, aurochs, and giant elk meat. But in the rainforests of Sri Lanka, where our ancestors ventured about 45, 000 years ago, people hunted more modest fare, primarily monkeys and tree squirrels.

Detailed explanation-4: -In a new book, Robert W. Sussman, Ph. D., professor of anthropology in Arts & Sciences, goes against the prevailing view and argues that primates, including early humans, evolved not as hunters but as prey of many predators, including wild dogs and cats, hyenas, eagles and crocodiles.