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4 votes
What structures of the circulatory system carry blood containing carbon dioxide from the body back to the heart ?

2 Answers

2 votes
The lungs. The left and right ventricle I believe.
answered
User Zon
by
8.2k points
4 votes
the answer is air sacs

your welcome :))

answered
User Killogre
by
8.0k points

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