If the Conditions Required for Substantial Amounts of Oxygen to Build

question 1

Multiple Choice

If the conditions required for substantial amounts of oxygen to build up in a planetary atmosphere are quite rare, then life on other worlds

• A) will probably not be present
• B) will progress much more rapidly because there would be less oxidation
• C) will progress at a similar rate as that on the Earth, except that it will remain anaerobic
• D) may still be common but may never be able to evolve past microscopic forms

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