![]() For Earth-based life, this is basically (but not literally):Īnimals: carbon + methane + hydrogen peroxide = spew out O2 You will always need a chemical reaction which is exothermic ("energy positive") to "run" your organisms. Quote from: Bynaus on 01:21 pm Breathing = "buring". You would need oxygen (or another gas you can react the methane or CO2 with) for that. In a CO2 + methane atmosphere, you cannot have fires. So for your plants you would have to find an energy-negative reaction which produces sugars AND releases methane.Īt a nearly 1 bar CO2 atmosphere, make sure your planet is far enough from its star, otherwise you might end up with quite a bit of greenhouse warming. Photosynthesis only makes sense if it yields material which the plant can use to grow, like sugars. To make that "energy negative" work, plants have learned to use sunlight to provide the necessary energy. The goal of photosynthesis is exactly the opposite of the reaction above: take water and CO2, produce sugars (used to build up the plant) and release waste oxygen. In this case, the H2 is found in hydrothermal vents at the bottom of the ocean. There are bacteria on Earth which do not breathe methane, but they produce it as a waste product, the so-called "methanogens". And the whole process should make sense in terms of energy. If you want to "breathe" methane (CH4), you need to react it with something - if that should result in the release of oxygen, whatever that "food" is will have to contain a lot of O. For Earth-based life, this is basically (but not literally):ĬO2 + H2O have less chemical energy than "CH2O" and O2, so reacting the latter will release some energy which the organisms can use.
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