The table below shows the age of fossils found in four separate layers of an undisturbed rock: fossils in rock layers layer fossil in layer age of fossil (million years) a w 550 b x 240 c y 680 d z 450 which is the topmost layer of the rock? layer a layer b layer c layer d

Cells tend to have a relatively small and uniform size. why aren’t cells larger?

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

Identify two examples of chemical reactions that you have encountered during the last week. identify an exothermic and endothermic reaction. explain.