Identify correct pairs of gases and their corresponding sources.
A
Vehicles
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B
Cow dung
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C
Sea water
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D
Plants
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Solution
Correct pairs are: Vehicles release carbon dioxide from the exhaust after combustion of fuel. Cow dung is collected to produce biogas. Methane is a major component of biogas. When sea water vapourises water vapour is formed. Plants release oxygen as a by product of photosynthesis.