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    Biology Concepts and Applications
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    Exam 7: Releasing Chemical Energy
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    Before Photosynthesis Evolved, ____ Was a Very Small Component of Earth's
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Before Photosynthesis Evolved, ____ Was a Very Small Component of Earth's

Question 40

Question 40

Multiple Choice

Before photosynthesis evolved, ____ was a very small component of Earth's early atmosphere.


A) carbon dioxide
B) nitrogen
C) water
D) oxygen
E) argon

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