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Interesting tidbit: from left to right, these are ordered by the efficiency of the oxygen transportation, highest to lowest.
Blue blood may be cool, but red blood is better for you.
I guess I could google it but for the sake of the comment section is that from highest to lowest or the other way around?
Highest to lowest. I edited it into the comment.
Amazing that Vulcans aren’t mentioned on this list. And on a more serious note: humanoids with green blood are apparently not that impossible!
