First time poster, please be gentle.
Long story short, my own alien worldbuilding/speculative biology project involves the idea that cyanobacteria and other oxygen producers never evolved and other bacteria took its place. Life on this planet has evolved to be both autotrophic and heterotrophic at the same time, with varying degrees one way or the other. To fill plant and animal type rolls.
I'm willing to change my world given new information but its planned to be a metal rich world with increased volcanism and similar temperatures to earth. The "increased volcanism" is an early idea to explain outgassing early microbes could exploit and how usually rare metals (Titanium, Platinum, Chromium, ect...) are commonly accessible. This is subject to change.
Is my proposed "Carbon" cycle theoretically sound? I'm not a chemistry major by any stretch. I believe the reactions are balanced throughout the plant/animal cycle, where the Plants come to a net positive enthalpy and animals come to a net negative. Could liquid water even exist on this planet?
The main proposed atmospheric gases are and their quantities:
- Methane (4%)
- Acetylene (8%)
- Carbon Dioxide (10%)
- Hydrogen (Trace gas)
- Nitrogen (75%)
These atmospheric numbers don't come from any sources and are made up.
The "Plant" type roll: *
- 3 CH4 + CO2 -> 2CH3CHO + 2H2
- C2H2 + H2O -> CH3CHO
- 2 CH3CHO + 5O2 -> 4CO2 + 4H2O
- 4CO2 + 2H2O -> 2C2H2 + 5O2*
Note that each of these are reactions that take place separately within the organism. With Methane, Acetylene, and CO2 being broken down photosynthetically to provide energy in the form of Acetaldehyde. Releasing some Acetylene, CO2, and Hydrogen gas as waste.
The Animal type roll: *
- CO2 + 4H2 -> CH4 + 2H2O
- C2H2 + 2O2 -> H2 + CO2
- CH3CHO + H2O -> C2H4O2 + H2
- C2H4O2 + H2O -> 2CH4 + 2O2*
These organisms would breath CO2, Acetylene, and Hydrogen. Looking to intake the Acetaldehyde to be broken down into Methane waste and usable oxygen. Again these reactions would take place separately.
The Oxygen's in these reactions are produced and used internally, mediated throughout the organism through some "magical enzyme" means. This idea comes from earth plants, in photosynthesis. A reaction that normally would take more energy that is gains, but its ok because SUN. The oxygen is not supposed to be energy balanced, but so there is no need or excess of the molecule.
If this idea is completely wrong please tell me. Or if you have better suggestions on what to use as an energy source I'd be happy to hear. Discussion on how life would potentially evolve using this system are welcome too.
Thanks to any and all who reply - Austin