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.
The first modern humans to evolve in Africa lived mainly on meat. By 70,000 years ago, they had switched to a marine diet consisting largely of shellfish. This new research suggests they moved along the coasts of the Arabian peninsula into India, Indonesia and Australia about 65,000 years ago.