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ivann1987 [24]
3 years ago
5

13. What causes a heartbeat?…………

Biology
2 answers:
s2008m [1.1K]3 years ago
4 0

Answer:

A

Explanation:

I think i remember that from heatlth.

brilliants [131]3 years ago
3 0

Answer:

A

Explanation:

Stretching of the atrium and ventricle muscles

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