<span>b. Exercise
If we conduct a research investigation in these given situation. More specifically, an experiment this would suggest a most probable scenario of a cause and effect situation or technically called causality.
Here the Independent variable is the exercise
The dependent variable is the endurance.
Hence regular EXERCISE increases endurance. </span>
It is not c or d. I think it is a.
Summary. Cellular respiration is the aerobic process by which living cells break down glucose molecules, release energy, and form molecules of ATP. Overall, this three-stage process involves glucose and oxygen reacting to form carbon dioxide and water
