They don't. Living beings are believed to have evolved much later.
Accretion
This will only occur if the alpha carbon to the carbonyl group can be protonated. The keto form of acetone (for example), would be a -CH2COCH3. The alpha carbon has lost a hydrogen and is negatively...
When organs form together they form organ systems. Exapmles are the digestive system and the nervous system.
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