A teacher is demonstrating that the boiling point of water does not change with water volume. Which of these should the teacher perform to support this hypothesis?
A. Heat equal volumes of 10°C and 20°C water for 15 minutes each.
B. Heat equal volumes of water for 10 and 20 minutes and record any change in the volumes.
C. Heat 100 mL and 300 mL of water and record the temperature when boiling occurs.
D. Heat 150 g and 100 g of water until the containers are completely dry.

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