O₂ Is Critical for Terrestrial Life on Earth Because It

question 193

Multiple Choice

O₂ is critical for terrestrial life on Earth because it

• A) allows for anaerobic metabolism.
• B) blocks UV radiation.
• C) provides energy to some basic forms of life.
• D) provided food for early prokaryotes.
• E) once led to production of ozone in the upper atmosphere.

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