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Oxygen ( ) Is

Question 7

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Oxygen ( Oxygen ( ) is A) a gas which principally originates from volcanic sources. B) a by-product of photosynthesis. C) one of the gases from Earth's earliest atmospheres. D) now measured at 78.084% by volume in the homosphere. ) is


A) a gas which principally originates from volcanic sources.
B) a by-product of photosynthesis.
C) one of the gases from Earth's earliest atmospheres.
D) now measured at 78.084% by volume in the homosphere.

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