Limiting factors help regulate the size of a population. Which of these limiting factors does not depend upon the density of a population?

A. food
B. a natural disaster
C. space
D. disease

One day you learn that this same wealthy friend has become active in a community organization that serves the mentally challenged and their parents. you are told that her work with mentally challenged children consumes most of her weekends and a substantial part of her income and that she lives in modest circumstances. you find this hard to believe, and you suspect that somehow she is profiting from her involvement.