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.
Human ancestors are believed to have originated in middle Africa. Humans' skin color changed over time, because selection acted against some of the traits humans possess in re â¦ lationship to the advantage of their survival and fitness.he term human, in the context of human evolution, refers to the genus Homo, but studies of human evolution usually include other hominins, such as the australopithecines.