Answer:
-Blood in the heart only flows one-way
-The atria pump oxygen-rich blood to the body
So that we can be healthy and learn how to take good care of our bodies
Well I think all of theses could have a factor, but i feel that B is the answer
Your heart rate might be higher on a regular basis, and your fitness levels may go up because you are training your body and it is adapting to what you are doing. you can monitor it by measuring how far you run, doing blood pressure, checking your pulse etc
The body mass index is a weights in kilograms divided by the square of height in meters
