20
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