Charlie was a 26-year-old drummer from San Francisco. He was a high school music teacher who had just returned from participating in a teacher exchange program in Mali. A week after his return, he developed a reaction to what he thought was an insect bite on this left hand. After a few days, the site became swollen and blistered. Finally, the lesion turned into a dark black ulceration, and it was at this point that Charlie sought out medical attention.

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