What Is a Critical Load

Multiple Choice

What is a critical load?

A) the amount of nutrient augmentation necessary to bring a depleted habitat back to its former level
B) the level of a given toxin in an ecosystem that is lethal to 50 percent of the species present
C) the amount of added nutrient that can be absorbed by plants without damaging ecosystem integrity
D) the number of predators an ecosystem can support that effectively culls prey populations to healthy levels