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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
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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!
sakoon
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Yesterday
Thanks
spaghetti
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2 hours ago
this is exactly what I needed
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