While some autotrophic and mixotrophic organisms like cyanbobacteria and some dinoflagellates may benefit from higher CO2 levels as evident in low pH water ,the CO2 level and O2 level are not interdependent .There can be high O2 and high CO2 and vice versa.
The heterotrophic bacteria that use organic carbon also produce some CO2.
The heterotrophic bacteria that use organic carbon also produce some CO2.
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