A) Quantity of food
B) Predation
C) Weather
D) Environmental resistance
E) Competition

A) trophic level.
B) population.
C) ecotone.
D) community.
E) aggregation.

A) a factor that decreases both death rates and birth rates.
B) limits imposed on population growth by only the living environment (e.g., predators or competitors).
C) limits imposed on population growth by both the living and nonliving environments.
D) limits imposed on population growth by only the nonliving environment.
E) a factor that increases both death rates and birth rates.