The arrows in the diagram represent the energy available to the next level of the pyramid. What percentage of sunlight is absorbed by the oak leaves? (Hint: Energy available to oak leaves / Sunlight hitting earth's surface x 100 = ?)

Aflame cell is at the end of each tubule of the nephridium malpighian tubules kidneys none of the above

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

What is the ecological role of food chains and food webs