shemikavjones
shemikavjones shemikavjones
  • 21-03-2018
  • Biology
contestada

_______________________________ are the smallest, thinnest blood vessels in a closed circulatory system and are the site of the exchange of oxygen and carbon dioxide.

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springert447
springert447 springert447
  • 21-03-2018
the answer is capillaries 
hope it helps 
please mark as brainliest
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