The most apparent change during the evolutionary history of Homo sapiens is traced by: Remarkable increase in the brain size. Loss of body hair. Walking upright. Shortening of the jaws.

Human evolution is characterised by a number of morphological, developmental, physiological, and behavioural changes that have taken place since the split between the last common ancestor of humans and chimpanzees. The most significant of these adaptations are as followed: 1. Bipedalism 2. Increased brain size 3. Lengthened ontogeny (gestation and infancy) 4. Decreased sexual dimorphism