6 How do atoms absorb & emit light? â¢ Key idea: Energy â¢ A photon carries energyâ¢ Electron in orbit has energy because it is moving and it is pulled by nucleus. â¢ When atom absorbs photon, energy of photon promotes electron to higher energy.
Until now, researchers believed that homo sapiens, the direct descendants of modern man, evolved in Africa about 200,000 years ago and gradually migrated north, through the Middle East, to Europe and Asia.
Scientific consensus puts the earliest known ancestors of modern humans in East Africa, roughly 200,000 years ago. The first wave of humans to migrate out of Africa about 85,000 years ago followed the coasts through the Middle East, into Southern Asia via Sri Lanka, and eventually around Indonesia and into Australia.