THE EARTH

Millions of year ago the universe was a complex and compact mass called Pangea. The Pangea underwent various physical and chemical changes. Their occurred a big change that broke off the pangea and rift were formed. The gaps between the rifts were filled by water. Through many physical and chemical reactions single celled life appeared in water and later complex life developed on the earth. Nearly 44 lac years ago early man appeared on the land of east Africa. They were bipedal. After 10 lakh years a quite different monkey like animal appeared called Acrystallopethicus. They were purely bipedal and had to travel long distance in search of food. By that time a natural change occurred, the spreading of glaciers and contraction for lacs of years and only those could adopt themselves survived. After 20 lacs Homo erectus appeared in the rift valley, their brain size was two times than that of Australlopethicus. They were carnivorous; they discovered fire for cooking the food. They started to live in a colony. They were social in behavior and that finally transformed in to Homo sapiens. Dryopithecus – Ramapithecus- Homo erectus – Neanderthals – Homo Sapiens