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The heart has ___one way valves which open and close with each heartbeat.
O one
O two
O three
O four
1 answer
four
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The heart has____one way valves which open and close with each heartbeat.
1 point) O one O two O three O four
The heart has ____one way valves which open and close with each heartbeat.
(1 point) Responses one one two two three three four