Question

Plants obtain nitrogen from the:

soil
atmosphere
water table
respiration of animals

Answer 1

The answer is that it gets nitrogen from the soil.

Answer 2

Which population would most likely increase if the weasel was removed from the food ... of organisms at each level decreases while moving up the energy pyramid? ... The animals at higher levels are more competitive, so fewer animals survive. .... Although plants and other producers make up the first trophic level of all food ...