The energy that the hawk has taken isn't enough for another animal to get any benefit therefore the pyramid has a limitation.
I’m too certain but i believe the answer is recreation
They actually don't eat "everything" , ants take big abundances of food to store for themselves and all the other ants its just a basic jobs that all the ants do ...
The mushroom will get 0.05 kcals of energy units in the end. This is because at each level, you only pass on 10% of the energy, which then results in the mushroom getting only 0.05 kcals by the end.
B. the weathered mountain would appear rounder in shape.