Through respiration, humans breathe in O2 and breathe out CO2. However, what would happen if we did not breathe in O2?
a. We would not be able to synthesize organic molecules from inorganic molecules.
b. We would not have enough enzymes to catalyze reactions.
c. We would not be able to perform lactic acid fermentation.
d. We would not make enough ATP to meet our energy requirements
Answer: d
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