Answers

2016-02-03T19:20:12+08:00
It is like the alveoli it is also the place where oxygen and carbon dioxide takes place.
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i like your answer its exactly in the choices
on letter b
Ok.  :-) 
2016-02-04T17:49:37+08:00
It is the smallest blood vessels in the body, comnceting the smallest arteries to the smallest viens.

it is also the actual site where gases and nutrients are exchanged.
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