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During the carboniferous period, the oxygen level was 35%. Why did the oxygen level drop?
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What determines the level of cloud coverage across the globe?
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Why isn't kilogram defined by water anymore?
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During the carboniferous period, the oxygen level was 35%. Why did the oxygen level drop?
1115
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10
9
8
7
6
5
4
3
2
1
0
What determines the level of cloud coverage across the globe?
7
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9
8
7
6
5
4
3
2
1
0
Why isn't kilogram defined by water anymore?
1
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