Case control study 2*2 table

Because without physical activity, the body has extra "energy" if you will, and so when it is time for bed you are not tired, so you end up staying up all night. also there is probably an effect on your internal clock, which messes with your melatonin production which goes hand in hand with your sleep cycle

Answer///blank (1) dea; ///drug enforcement agency;                                 blank(2) fda; // food and drug administration;

Cells are the smallest. bones, muscles, and tendons are all made up of different type of cells.hope my answer you : )