How did life begin on Earth?

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<blockquote><p><strong>How did life begin on Earth?</strong></p></blockquote>
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Begining of life on Earth

To study the origin of life on the earth, the scientists study the fossils of those animals trees and plants which lived on the earth millions of years ago. Excavations carried out at various places on the earth have made available fossils, rocks and bones which throw a significant light on the existence of living beings of ancient times. There are many theories about how life began on earth. Almost all religions teach that all forms of life were created by some divine or supernatural beging or force. Another theory states that life originally came to earth from outer space through micro-organisms. Many biologists and biochemists believe that life developed from non-living materials.

life on Earth

However scientific studies have revealed that life on the earth started with the unicellular organism called amoeba. This happened some 570 million years ago. From this very unicellular amoeba evolved the multicellular life on the earth. The first 345 million years saw the development of marine life. The subsequent 160 million years had the development of reptiles. In the last 65 million years the evolution of mammals took place. Mans birth is a phenomenon only one million years old. Around 3500 million years ago the earths atmosphere was full of ammonia, methane hydrogen water vapour etc. At the time the earth was very hot and sky was overcast with clouds. Lightning and thunder were common occurrences. The electric discharge during the lightning led to the chemical combination of the formation of proteins carbohydrates etc. Even through we have been able to solve many mysteries relating to the origin of life on the earth, there are many more which are still needed to be looked into.

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