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Q&A Could an organism have several oxygen transport proteins?

Can an organism have several types of oxygen carriers in its blood? Note that I am not asking how the creature could have evolved, that is too much sci-fy, genetically engineering or Deus Ex Mach...

3 answers  ·  posted 5y ago by Ender Look‭  ·  last activity 5y ago by Ender Look‭

Question biology creature-design blood