One of the Reasons That Free Oxygen in Our Atmosphere

question 67

Multiple Choice

One of the reasons that free oxygen in our atmosphere is important to the development and maintenance of life on Earth is because oxygen:

• A)combines with iron in volcanic rocks.
• B)can form ozone and block some UV radiation.
• C)is necessary for photosynthesis to occur.
• D)reduces atmospheric temperature.
• E)was very abundant in Earth's early atmosphere.

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