Heart disease is the leading cause of death among both men and women in the united states. it is usually caused when a sticky substance called plaque builds up in the arteries. often, the only symptoms of heart disease are chest pain or discomfort.

why do you think heart disease is so prevalent in the united states? how could heart disease affect other organ systems?

Aresearcher designed an investigation to test what effect eating different types of food would have on blood insulin levels. she selected 10 male subjects who were all 25 years of age and in good health. the experiment took place over 3 days. at 8: 00 a.m. on each day, the subjects ate a meal consisting of only 1 type of food. they had their blood insulin levels measured after consuming the meal. on day 1 they ate a high fat diet, on day 2 they ate a high protein diet, and on day 3 they ate a high sugar diel what is the independent variable in this experiment? a the age of the subjects b the blood insulin level c the type of food consumed d the time of day the meal was consumed