20 Points!!!!!!!!!!!! Please Help!!!!

1. What does the term carrying capacity describe?
A) The maximum number of birth rates for a population.
B) The ability of a population to accept new immigrants.
C) The population size that the environment can sustain.
D) The ratio of birth rates to death rates in a population.


2. Which factor is a density-dependent limiting factor on the population of a species?
A) predation
B) unusual weather
C) natural disasters
D) seasonal variation


3. Which nutrient cycle is most affected by the over-use of ammonia fertilizers on commercial farms, as well as by the accumulation of waste on cattle farms and feed lots?
A) water
B) carbon
C) nitrogen
D) phosphorus