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Because when mammals breathe (Respiratory) it causes their blood to circulate (Circulatory) ad they need their blood to circulate to live. Hope this was helpful. :)
The work together by.....
the respiratory and cardiovascular system work together/
The central nervous system coordinates.
The central nervous system coordinates.
poontah
they both help your brain
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The respiratory and cirulatory system are alike by they both work together to bring oxygen to the cells of the body.
The respiratory and cirulatory system are alike by they both work together to bring oxygen to the cells of the body.
the respiratory and cardiovascular system work together/
The respiratory and circulatory systems work together as a unit to exchange gases between body cells and the environment