micniell1Tian
micniell1Tian
13-05-2016
Biology
contestada
The heart valves act like doors.
TrueFalse
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princesslove1234
princesslove1234
13-05-2016
its true as you breath your heart and lungs go in and out as if you were swinging a door open and shut letting oxgen in and out hope i could help :)
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