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Q&A Is a double circulatory system useful?

Humanoid and Planet I understand that you might think "2 circulatory systems require more oxygen so obviously it is not useful." but I know my Kepler Bb humanoids inside and out from anatomy and p...

2 answers  ·  posted 8y ago by Caters‭  ·  last activity 8y ago by Caters‭

Question earth-like humans earth anatomy