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    Biology Life on Earth
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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 48

Question 48

Multiple Choice

Before photosynthesis evolved, ________ was rare in Earth's atmosphere.


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

Correct Answer:

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