Final answer:
The transition to Homo sapiens living all over the world is explained by human migration and adaptation. Originating in East Africa, our ancestors spread globally, adapted to various environments, and influenced the planet's ecosystems.
Step-by-step explanation:
Today, Homo sapiens lives everywhere. How this transition occurred is the topic of human migration and adaptation. Our species began as small hunting and gathering bands in East Africa nearly 200,000 years ago. Throughout the millennia, Homo sapiens migrated to every corner of the globe. This migration was assisted by environmental changes, such as the Bering Land Bridge that connected Asia to the Americas during an ice age. As a species, we possess a remarkable ability to adapt which is evident from our survival and thriving in diverse environments. This adaptation continues as we face modern challenges like climate change and biodiversity loss. The 'Out of Africa' model is the most accepted theory describing this dispersal, asserting that Homo sapiens first appeared in Africa and then spread outwards, replacing other human species.
Our ancestors' journey led them to expand into various global climates and territories, adapting culturally and biologically along the way. From the use of stone tools to the advent of agriculture, human beings have constantly evolved and changed, shaping both our species and the planet. Such change and adaptability are key themes throughout human history and remain critical as we navigate the future.