Scientist who agrue that modern humans evolved from a single population believe that humans came from the continentof?

Answer 1

Africa. Specifically a group of people called the San. We know this because of genetic markers we know have been passed through the generations.

Some of these people migrated north during a time period when the Sahara desert was was a grassland. These people then migrated again. Those that went west became the Europeans, those that went east became Indian and Chinese. Some of these people migrated south to Australia, and some went north into Russian. Then some of these continued to travel east into Canada then south into North America. These became the Native Americans, then further south into South America.