You are looking at very lightly stained cells under the microscope, and you want to increase the contrast so that you can see them "better." you the iris diaphragm to the light.

Aprimary producer stores 9,000 kcal. in the energy pyramid, if a primary producer is consumed by a first-level consumer, and that first-level consumer is consumed by a second-level consumer and the second-level consumer is consumed by a third-level consumer, how much energy is stored by the third-level consumer from the primary producer? *