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The composition of the atmosphere at 21000 ft is approximately:A.78% He, 21% O2 and 1% COB.78% He, 21% O2 and 0.003% CO2 + tracesC.78% N, 21% O2 and 1% CO2 + tracesD.78% N, 21% O2 and 1% CO + traces
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