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Carbon dioxide is a 'heavy' gas. So it falls to the earth/ground. So its concentration is highest at ground level. By this, plants absorb CO2, and in the process of photosynthesis convert CO2, into oxygen (O2) release back into the atmosphere, and the Carbon (C) component remains in the plant as biomass.

Relative molecular massex of atmospheric gases.

H2O = 18

N2 = 28

O2 = 32

CO2 = 44

So CO2 is the heaviest hence its falls to the ground.

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lenpollock

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9mo ago

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