Final answer:
Early humans (Homo sapiens) left Africa 100,000 years ago due to the changing climate and the limited availability of resources. This migration was driven by the need to find more favorable living conditions.
Step-by-step explanation:
Research suggests that early humans (Homo sapiens) left Africa approximately 100,000 years ago due to several factors. One of the main reasons for this migration was the changing climate in Africa, which became increasingly dry, resulting in fewer available resources for survival.
As hunter-gatherers, early humans relied on the availability of plants and animals for sustenance. With the scarcity of these resources in Africa, some groups of Homo sapiens migrated out of the continent in search of more favorable living conditions.