I believe all of the above!
<span>. over a long period of time </span>
I believe the closest related is speices and class
ATP, mitocondria
the stages are the citric acid cycle and the electron transport chain
<span>Osteoporosis is most likely to be affected by : Phosporus cycle.
basically, our skeleton are the warehouse of two substance, calcium and phosporous. If our skeleton has insufficient amount of these two susbtance, it will weakened its composition and caused the osteoporosis</span>