Jacinth Chew's answer to Marnie White's Secondary 4 Biology question.

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Jacinth Chew
Jacinth Chew's answer
5 answers (A Helpful Person)
1st
Remember to check the length of the heartbeat instead of only using the value given on the diagram! Hope this helps!
Marnie White
Marnie White
5 years ago
Thank you so much you explained it sooo well