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The $\underline{\text{primary}}$ Source of Oxygen for Earth's Atmosphere During the Past Half

Question 34

Multiple Choice

The $\underline{\text{primary}}$ source of oxygen for Earth's atmosphere during the past half billion years or so appears to be

A) volcanic eruptions.
B) photosynthesis.
C) radiant heat.
D) exhalations of animal life.
E) transpiration.

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