tersmalawilli tersmalawilli

27-04-2016
Biology

contestada

The beating of your heart is caused by _____.
valves opening and closing
contraction of heart
blood moving through the heart
relaxation of the heart

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bryanna0105 bryanna0105

16-03-2019

B is your answer hope this helps

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natashamehul natashamehul

23-02-2021

Answer:

I think it is B

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