Use the figure to calculate the heart rate of the dog in beats per minute

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Alevel.student
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I have an a level biology exam question here which I'm stuck with. Supposedly the answer is 125 beats per minute, however I don't have the mark scheme. I don't know which graph out of all three given, to work out the heart rate off, or even how to do it. Thanks

The graph is on question 6 in the link.

http://vle.sjd.ac.uk/pluginfile.php?...orcedownload=1

"Use the figure to calculate the heart rate of the dog in beats per minute" (2 marks)
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Hazelly
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Hello,

We’re unable to see the graph as it’s on a school account and requires a log in. It’s showing this:

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