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How much oxygen is contained in the atmosphere?
OA) 20%
OB) 21%
OC) 22%
OD) 23%
B~ 21%
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What types of energy transfers and energy transportations are involved in the domino chain reaction?
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How much oxygen is contained in the atmosphere?
OA) 20%
OB) 21%
OC) 22%
OD)...
OA) 20%
OB) 21%
OC) 22%
OD)...
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