Answer: C. Always decreases but population size may increase or decrease.
According to the 10% law in ecological dynamics, the energy decreases by 10% when organism in lower trophic level being consumed by organism in the higher trophic level. The highest trophic level receives the lowest energy.
As matter and energy move from grasses (lower trophic level) to coyotes (higher trophic level) the amount of available energy will always decrease as per the 10% law but population size may increase or decrease.
The substances used in the beginning of a chemical reaction are called the reactants and the substances found at the end of the reaction are known as the products.
