Biology, 24.03.2020 01:29 sportygirlscand

How much oxygen is contained in the atmosphere?
OA) 20%
OB) 21%
OC) 22%
OD) 23%

B~ 21%

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How much oxygen is contained in the atmosphere?
OA) 20%
OB) 21%
OC) 22%
OD)...