7. Which of the following shows the correct organization in the human body, from simple to most complex? *
A-nerve cell- spinal cord organ-nerve tissue-nervous system
B-nervous system-nerve cell-nerve tissue-spinal cord organ
C-spinal cord organ-nerve tissue-nervous system-nerve cell
D-nerve cell-nerve tissue-spinal cord organ-nervous system

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