what made it so people breath in CO2 and breath out O2?

Question: what made it so people breath in CO2 and breath out O2?
- Keywords:
  carbon dioxide,
  oxygen
Asked by JackWillGoHome to Sajid on 8 Nov 2017.
- Sajid Javed answered on 8 Nov 2017:
  
  i think you have this the wrong why round. i’m not sure of the exact reason but if i was to guess i’d say evolution. Plants are the only things which take in co2 and breath out o2.

JackWillGoHome commented on 10 Nov 2017:

thank you for the help

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Question: what made it so people breath in CO2 and breath out O2?