Our Earth was originated by a giant explosion took place n the universe before 3.5 billion years ago. Gradually the life was originated. The first atmosphere contained Carbon dioxide, Methane, Hydrogen dioxide etc. These atmospheric gasses reacted each other by the energy of lightning, volcanic eruptions and ultra violet rays of the sun and made ingredients suitable for the origination of organisms. Then those ingredients were mixed with rain water ad collected n seas which is know as primordial soup.
Then the first living being called a precell was originated in it after 1 billion years. It was the anaerobic, heterotopic, unicellular bacteria. Then the bacterium developed into a algae. By that algae the atmosphere gained oxygen. Algae were developed as plants and bacteria were developed as animals. With the time human was developed before 2.5 billion years ago.
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