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    Biology Life on Earth Study Set 1
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    Exam 7: Capturing Solar Energy: Photosynthesis
  5. Question
    Before Photosynthesis Evolved, Was Rare in Earth?s Atmosphere
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Before Photosynthesis Evolved, Was Rare in Earth?s Atmosphere

Question 4

Question 4

Multiple Choice

Before photosynthesis evolved, was rare in Earth?s atmosphere.


A) N2
B) air
C) O2
D) CO2
E) H2O

Correct Answer:

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