The wolf weighs 40 kg. Build an ecological pyramid of mass by steps.

1) To draw up an ecological pyramid, it is necessary to rely on some kind of food chain. Suppose, in our case, it will look like this: oak acorns – wild boar – wolf (other options are possible, longer ones).

2) Only about 10% of the energy of the previous one can pass to each subsequent trophic level. Roughly speaking, in order for a wolf to gain 40 kg (10%), it needs to eat 10 times more (100%).

Then the biomass of wild boars will be 40 * 10 = 400 kg. In turn, for this they need to eat 10 times more acorns: 400 * 10 = 4000 kg or 4 tons.