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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
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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
You make an excellent tutor!
sweetalia
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Yesterday
Thank you, thank you, thank you!
mmmm_dat_userna
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2 hours ago
Thanks
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