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Tiny, thin-walled blood vessels that allow the exchange of gases and nutrients between the blood cells.<ref>Wile, Dr. Jay L. ''Exploring Creation With General Science''. Anderson: Apologia Educational Ministries, Inc.  
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Tiny, thin-walled blood vessels that allow the exchange of gases and nutrients between the blood cells.<ref>Wile, Dr. Jay L. ''Exploring Creation With General Science''. Anderson: Apologia Educational Ministries, Inc. Capillaries are the smallest blood vessels.
    
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