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    Campbell Essential Biology Study Set 3
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    Exam 6: Cellular Respiration: Obtaining Energy From Food
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    Large Amounts of Oxygen Gas First Appeared in Earth's Atmosphere
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Large Amounts of Oxygen Gas First Appeared in Earth's Atmosphere

Question 13

Question 13

Multiple Choice

Large amounts of oxygen gas first appeared in Earth's atmosphere about ________ of years ago.


A) thousands
B) millions
C) billions
D) hundreds

Correct Answer:

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