Multiple Choice
Oxygen (O²)
A) is a gas which principally originates from volcanic sources.
B) is a by-product of plant-leaf operations that are stimulated by light.
C) is one of the gases from Earth's earliest atmospheres.
D) is now measured at 78.084% by volume in the homosphere.
E) exists in quantities in the atmosphere which are in danger of becoming depleted.
Correct Answer:
Verified
Correct Answer:
Verified
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