If the Conditions Required for Substantial Amounts of Oxygen to Build

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