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Q&A Could a semi-permeable membrane, which releases CO2 but contains O2 and nitrogen, biologically exist?

I'm trying to create an alien which has external lungs. Air can be inhaled normally however, is it plausible that the material the lungs are made of is semi-permeable. Containing the nitrogen and o...

2 answers  ·  posted 6y ago by Lutro‭  ·  last activity 6y ago by Lutro‭

Question biology reality-check creature-design xenobiology