What exactly do we mean by the

term evolution????

it is the study of the

history of life forms on earth

• To understand the evolution that has lead to the formation of flora and fauna around us today, we must

• Understand the context of origin of life , for that we must first

• Understand the evolution of earth which inturn requires understanding of

• The EVOLUTION OF THE WHOLE UNIVERSE itself

according to this belief life came out from decaying and rotting matter

• Oparin of Russia and Haldane of England proposed that the first life form could have come from pre existing non living organic molecules and that formation of life was preceded by chemical evolution

• At the time of this evolution conditions on earth were• High temperature• Volcanic storms• Reducing atmosphere containing CH4 , NH3, etc.

OPRAINHALDANE