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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O₂ is another way to represent oxygen (O2), which is critical for the production of ozone (O3) in the upper atmosphere. Ozone helps to block UV radiation, which would otherwise be harmful to most terrestrial life on Earth.

O2 Is Critical for Terrestrial Life on Earth Because It

O₂ Is Critical for Terrestrial Life on Earth Because It