The Accumulation of Free Oxygen in the Atmosphere

question 29

Multiple Choice

The accumulation of free oxygen in the atmosphere

• A) was a result of the accumulation of a by-product of a type of photosynthesis.
• B) prevented the further spontaneous generation of life.
• C) provided the opportunity to extract more energy through aerobic respiration.
• D) did not occur immediately after the earth was formed.
• E) did all of these.

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