Which of these statements is/are true about the given sample of air?

1.	Which of these statements is/are true about the given sample of air?
A.	Dissolved air from pond water
B.	Fresh air from a field
C.	Exhaled air
D.	Polluted air near a factory
Answer» D. Polluted air near a factory

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Which of these statements is/are true about the given sample of air?

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