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Card 6
Front
What reduced the amount of CO2 in the atmosphere
Back
Card 7
Front
What was the first evidence of oxygen
Back
Card 8
Front
Where did oxygen come from after
Back
Card 9
Front
How much nitrogen is there in today’s atmosphere
Back
Card 10
Front
How much oxygen is there in today’s atmosphere
Back
Card 11
Front
How much of other gases are there in today’s atmosphere
Back
Card 12
Front
What is one practical that can show how much oxygen there is in the atmosphere
Back
See full card set