Why are ecological pyramids shaped as pyramids?
a) because there is a large decrease in the amount of energy or biomass as you move from one trophic level up to the next?
b) because the movement of energy through the biosphere follows a path similar in shape to a pyramid
c) because decomposers form a wide base of support at the bottom of a food web similar to the base of a pyramid
d) because a pyramid represents a stable building form that is similar to the structure of a stable ecosystem