C. hypothesis. He is giving a possible answer to the question "why did the celery crisp when placed in water?"
Mostly through bites, I think.
Cyanobacteria don't need oxygen to survive they produce oxygen. They where the first ever known organisms on the planet and they produced oxygen in the oceans which was absorbed by iron deposits and then once the iron had oxygen the ocean got the oxygen until it got into the atmosphere and Eukaryota bacteria evolved. So the answer would be: <span>They convert nitrates from the water into nitrogen gas (N2) that is released into the atmosphere.</span>
If organisms that lived there before had exceeded the carrying capacity then the ecosystem would no longer be able to sustain life
