Prokaryotes Probably First Added Significant Quantities of Oxygen into the Atmosphere

question 220

Multiple Choice

Prokaryotes probably first added significant quantities of oxygen into the atmosphere when they

• A) used carbon dioxide as the source for ions in photosynthesis.
• B) used water as the source for ions in photosynthesis.
• C) metabolized hydrogen peroxide.
• D) metabolized sulfur dioxide.
• E) became endosymbionts within eukaryotic cells.

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