The correct answer is no replacement behavior.
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Ammonia (NH3), nitrate ions (NO3), and nitrite ions (NO2) .
Bases would CCAGAT. Hope this helps :)
The parts wich are derived from these three areas include:the cerebellum,the brain stem of the brain stem consists of the parts:the midbrain,bridge brain,the medulla oblongata.other parts of the brain including the thalamus,hypothalamus and limbic device.