I believe it’s D. It’s not A because when you use your muscles you’re getting micro tears that repair and grow.
In a study, the independent variable is the thing that you change to see how the change produces different results. In this study, the independent variable would be the use of nicotine.
Ate about 2000 calories yesterday she was not feeling well so she laid around and watch TV all day and burn one 1200 calories if Sandra did this all week she would lose weight because she is in a state of energy balance.
Hope this helps!
Steroids promote the growth of muscle
