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How were large amounts of oxygen first introduced into Earth's atmosphere?
Large amounts of oxygen were first introduced into Earth's atmosphere as a byproduct of photosynthesis.
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Asked 5/12/2011 8:31:19 AM
Updated 12/23/2016 11:42:56 AM
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This answer has been confirmed as correct and helpful.
Edited by Janet17 [12/23/2016 11:42:54 AM], Confirmed by Janet17 [12/23/2016 11:42:56 AM]
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Which law states that the orbit of each planet is elliptical and that the Sun is at one focus of each ellipse?
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Kepler's first law states that the orbit of each planet is elliptical and that the Sun is at one focus of each ellipse.
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