I know it's a delicate process to form carbon in stars but couldn't carbon have formed here through cellular respiration and nitrogen reaction from cosmic rays?
I meant if humans and other creatures turn oxygen into carbon, couldn't carbon have come from an organism or a whole lot of organisms?
Art
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No you need carbon to build the organisms and organisms turn Oxygen and Carbon into Carbon dioxide with a few intermediate steps that create sugars and then break them down.
It's not exactly a delicate process producing carbon in stars it generally occurs a few minutes before they go Nova.
Gary H
I am not aware of any type of cellular respiration or any biological process which can create one element from other elements.
As far as the nuclear fusion going on in the core of stars that produces carbon... I would not describe the process (or, more accurately, our guesses at what the process is) as "delicate". The reactions going in within stars are about THE MOST vigorous, energetic, powerful and violent as any reactions in the universe after the Big Bang.
Orange Bear
No. Nuclear fusion is needed to create new elements, and those temperatures only naturally can occur in stars. It takes a ton of heat and pressure to do nuclear fusion.