Are roaches evolving because i saw one the other day in my house so i sprayed the roach spray at it and that roach got up and like started running away like a human on its back legs and it took forever to die.

Aresearcher is interested in the effect of exercise on stamina in elderly patients. the patients are randomly assigned to be in a high-exercise or low-exercise training program. at the end of the program, their stamina is measured by seeing how long they can walk comfortably on a treadmill. identify the independent variable. identify the dependent variable and explain how it was measure.