Why does life sustain on earth?
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All the facts are necessary for life are present only on Earth.
1) Earth has an atmosphere containing the gases nitrogen, oxygen, and carbon dioxide, which are essential for life.
2) It has water in liquid form, which is essential for life.
3) Being at the right distance from the sun, it is neither as hot as Mercury or Venus, nor it is cold as planets which are further away.
4) It is also has a layer of ozone in its atmosphere which stops harmful ultraviolet rays.
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