The factors then being considered in a person or a population's ecological footprint would be the food consumption, energy usage, transportation usage and the amount of waste like if it has been recycled then. Hope these are the answers and would be of help then.
I think the answer is temperature because take water ice and steam for example cold ice room temp water and super hot steam
Next come organisms that eat the autotrophs; these organisms are called herbivores or primary consumers -- an example is a rabbit that eats grass. The next link in the chain is animals that eat herbivores - these are called secondary consumers -- an example is a snake that eat rabbits.
A curve on a graph that records the situation
The answer would be B. The available energy would decrease from the mouse to the hawk. As the trophic level goes up the energy decreases because some of the energy is lost in the form of heat for every energy transfer. This energy being lost cannot be used by the organisms on the next level.