The earth is the only planet known to have life on Earth.Why?
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Earth is the planet we live on. It is the third planet from the Sun. It is the only planet known to have life on it. The Earth formed around 4.5 billion years ago.[28][29] It is one of four rocky planets on the inside of the Solar System. The other three are Mercury, Venus and Mars.
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all conditions were favorable for the existence of life ....
hence earth is the only known planet to have life
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