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The biodiversity that is known today has been said to be formed from very simple

unicellular organism due to evolution. In this evolution, origin of human evolution can be

shown as per the picture given below. Last dinosaurs disappeared approximately seven

crore years ago. At that time, monkey-like animals are said to be evolved from some

ancestors who were more or less similar to the modern lemurs. Tail of these monkey-like

animals of Africa is said to be disappeared about 4 crore years ago. They developed due to

enlargement in brain their hands were also improved and thus ape-like animals were

evolved. Meanwhile, these ape-like animals reached the South and North-East Asia and

finally evolved into gibbon and orang-utan.

Remaining ape-like animals stayed in Africa and from them, gorilla and chimpanzee

evolved about 2.5 crore years ago. Evolution of some of the 2 crore year old species of apes

seems to be occurred in different way. They had to use their hands more for eating food and

other work.