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B
Troposphere
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C
Ionosphere
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D
None of the above
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Solution
The correct option is A Troposphere
The atmosphere is made up of five layers mainly, exosphere, thermosphere, mesosphere, stratosphere and troposphere. The troposphere is about 12 km thick and is found at ground level. Living organisms are found in this layer. Most of the human activities take place in this region as this is the region where human beings live. The percentage of poisonous gas like carbon dioxide, nitrogen oxide etc. increases due to burning of fossil fuels which do not allow the heat to escape from the earth atmosphere and leads to increase in temperature and cause global warming.