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Why Can’t Humans Breathe Underwater ?

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Human lungs are not designed to extract oxygen from water as fish gills.

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This entry was posted in Health and tagged Health on September 1, 2015 by smarttoughmom.

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2 thoughts on “Why Can’t Humans Breathe Underwater ?”

mitchteemley September 2, 2015 at 10:04 pm

I learn a little something new from you every day, Martina!

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1. smarttoughmom Post authorSeptember 2, 2015 at 11:56 pm
  
  Aww Thank you, Mitch! This is who I am 🙂 And you write funny stories daily 😉
  
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