In general evolution is a dynamic process in which gradual change of body morphology takes place, after long period of time convert into more and more complex animal.Ĭhemical evolution describes chemical changes on the primitive Earth that gave rise to the first forms of life. There are different plants and the animals which evolve in different ways in different habit, habitat or adaption. Prior to 3.5 billion years ago the atmosphere probably consisted of carbon dioxide (CO2), carbon monoxide (CO), water (H2O), nitrogen (N2), and hydrogen.The hydrosphere was formed 4 billion years ago from the condensation of water vapor, resulting in oceans of water in which sedimentation occurred.Įvolution is a branch of science deals with the unfolding of new and complex species from simple species. ![]() These gases may have consisted of hydrogen (H2), water vapor, methane (CH4), and carbon oxides. In the first 500 million years a dense atmosphere emerged from the vapor and gases that were expelled during degassing of the planet's interior. Origin of earth and its atmosphere:Earth is believed to have formed about 5 billion years ago. ![]() ![]() Origin of life: It is generally agreed that all life today evolved by common descent from a single primitive lifeform. We do not know how this early form came about, but scientists think it was a natural process which took place perhaps 3,900 million years ago.
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