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For questions related to the biology of extra-terrestrial organisms. This tag implies the use of the science-fiction tag. Use the science-based or hard-science tags to impose greater scientific restrictions (see warning in tag wiki). The goal of this tag is to answer the question using known science.
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Blood for hydrogen breathers
Another thread (Other blood colors) had a user Jim2B post a very in depth post on possible blood colours for binding oxygen, but also referenced this gem:
Chloro-carbonyl-bis(tri phenylphosphine)-irid …