Hello!
The answer to 36: Only 10% of energy transfers from one level of the pyramid to the next.
37: The reason only this much energy is transferred is because the other amount of energy is released as heat or used by the organism(s) in each level.
38:This energy is released as heat as the organism performs daily life functions like eating, scouring, and simply moving around.
39: When autotrophs take in nutrients from the earth, they take in carbon and energy. These are either eaten by another organism or die and enrich the ground. The ones that are eaten by other organisms transfer energy to the organism they are consumed by. Wastes and other deposits back time earth keep the cycle going.
I hope this is accurate and helpful! :)