Which of the following is NOT a tenet of the cell theory?
A. All living things are made of cells.
B. Cells are the basic unit of structure and function in all living things.
C. New cells are produced from existing cells.
D. All cells have all the same structural parts.

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

Several billion years ago which gas was the least prevailant in the atmosphere

Eutrophication caused by human nutrient pollution.