Oxygen (O²)

question 85

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.

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Definitions:

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Recurring Sleep Stage

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