Homework Help: Biology

Posted by Anonymous on Saturday, September 22, 2012 at 11:53am.

The first cells evolved in an atmosphere that lacked free _____________. Their metabolism resulted in the accumulation of ________________ in the atmosphere. Fill in the blanks.

Biology - bobpursley, Saturday, September 22, 2012 at 12:15pm
oxygen, oxygen. The process by which this occurred is highly speculative.
Biology - Anonymous, Monday, September 24, 2012 at 9:20pm
Kdl

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