Human Evolution

Human evolution traces a sequence of ancestral forms leading to modern humans, with brain size, tool use, and posture changing progressively over time. Homo sapiens, meaning 'wise man', is the species to which all living humans belong and represents the most recent stage of this lineage, having arisen roughly within the last few hundred thousand years with the largest cranial capacity. Homo erectus is an earlier form that lived around 1.5 million years ago and probably used primitive tools, but it predates modern humans. Homo habilis, the 'handy man', is older still, associated with the first stone tools and a smaller brain, and is not the modern species. Australopithecus represents an even earlier ape-like ancestor that walked upright but had a small brain and is far removed from modern humans. As outlined in NCERT Class 12, Chapter 7 (Evolution), the hominid sequence proceeds from Australopithecus through Homo habilis and Homo erectus to Homo sapiens. As a chronological check, ordering these forms by increasing recency and brain size places Homo sapiens last, confirming it as the modern human species.