In the answers to this question, we've learnt that carbon dioxide is necessary for mammalian life, but is it necessary in the atmosphere/to breathe it in?
Or does the act of respiration give a human (or other animal) enough carbon dioxide to fulfill all of the functions that carbon dioxide is needed for?
Or, phrased another way, if you put an animal in a carbon-dioxide-free atmosphere, and continually removed the carbon-dioxide that they generate upon respiration/exhalation, would they get enough carbon dioxide to fulfill these requirements:
- fatty acid biosynthesis (FAS)
- mammalian/bacterial biotin-dependent carboxylation reactions.
- blood pH regulation