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Home Q & A Board Science-Related Homework Help Physics Astronomy
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adreamer adreamer
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6 years ago
The atmospheric carbon dioxide concentration
A) is higher than it has been at any time during the last 800,000 years
B) is higher than it has been at any time during the Earth's history
C) has remained roughly constant during the last 800,000 years
D) is lower than it has been at any time during the last 800,000 years
Textbook 
Life in the Universe

Life in the Universe


Edition: 4th
Authors:
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19Clyde19Clyde
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6 years ago
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adreamer Author
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6 years ago
Smart ... Thanks!
dearsophia21
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Yesterday
This site is awesome
klyn
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2 hours ago
Brilliant ツ
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