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A layer which covers the earth protects us from electromagnetic radiations , atmosphere consists of ionosphere , stratosphere , mesosphere , and the troposphere . Water cycle takes place in troposphere . Chemical reactions in troposphere makes life possible , oxygen in troposphere allows human life and carbon dioxide helps plants to perform their functions.
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Because it consists of biosphere where life exists due to the presence of water vapour,oxygen ,nitrogen and other gases which is essential for all living things.
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