Consider the ADH reaction and answer the following question. ADH stands for alcohol dehydrogenase. 
In this reaction, acetaldehyde represents the ____.
Definitions:
Praying Mantis
A predatory insect known for its distinctive posture that resembles prayer, belonging to the family Mantidae.
Selective Advantage
A genetic or behavioral trait that improves an organism's likelihood of survival and reproduction in a given environment.
Copulation
The act of sexual intercourse between two individuals resulting in the transfer of sperm to fertilize eggs.
Somatosensory Cortex
A region of the brain responsible for processing sensory information from various parts of the body, including touch, temperature, and pain.
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