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 food webs are usually triangular in shape

Answer should be A. It is an introduction of the trophic levels in a biological system. Vitality from the sun is exchanged through the biological community by going through different trophic levels. About 10% of the vitality is exchanged starting with one trophic level then onto the next, along these lines keeping an expansive number of trophic levels.

The ecological pyramids are shaped as pyramids themselves because the amount of energy decreases almost by ten percent, as we move from one trophic level to another. At the base, producers are placed. They synthesize their own food and are present in very large number. The organisms which consume them, are less in population, as compared to producers and have less energy as well, and this, is true for each next trophic level, and hece, the pyramid.