Jeffry was wondering why when he made breakfast, that after he was done cooking, the mass of everything he used was not the same. What best describes why this is so, according to the law of conservation of mass.

A: cooking causes water vapor to escape so it cannot be added to the mass
B: cooking makes things solid and that adds to the mass
C: cooking changes the matter so it is different

D: cooking did nothing so he measured the mass wrong

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