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1. The running one because your heart is tying to supply oxygen to your body.
2. Siting and standing because we are doing nothing we are vary still so our heart does not need to supply oxygen that fast.
3. I think it is accurate because the first two you are staying still so they were the same. The more motion and the faster the motion your heart rate will go up. That's why i think my data is accurate.
4. I noticed that as I got active my hart rate went up because my heart was trying to supply oxygen.
5.I think my heart rate changed when I got more active because my heart is trying to supply oxygen and nutrients to my muscles. That's why I think my heart rate changed as i got more active.