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Q&A Alternative elements for oxygen transport in an alien blood

I am designing an alien civilization for a story, and I am currently in the biological part. They will be oxygen breathers, so they will need to have that oxygen delivered inside their bodies, and ...

5 answers  ·  posted 6y ago by Carlos Zamora‭  ·  last activity 6y ago by Carlos Zamora‭

Question biology aliens oxygen blood xenobiology