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Q&A If our atmosphere was much thinner (half as thin as we have now) how would animals and humans evolve?

If our atmosphere was much thinner (half as thin as we have now) how would animals and humans evolve? Would we evolve completely different? Would we have a quite barren planet? Let's just say that ...

3 answers  ·  posted 10y ago by CrazySlayaNinjaBear‭  ·  last activity 5y ago by CrazySlayaNinjaBear‭

Question atmosphere humans fauna earth