A prairie nature reserve is home to a population of pheasants. This year, the population of pheasants has increased sharply, and scientists think the population has exceeded the carrying capacity. The reserve is also home to a small, scattered population of bison. Scientists think that the bison population is significantly below carrying capacity, although it has been increasing gradually from year to year.

Both the pheasant and bison populations of the nature reserve could be affected by a variety of limiting factors. Which limiting factor affects both populations about equally?
(A) competition within the population for food and water
(B) parasites that spread among species members
(C) a wildfire that spreads across the prairie grasses
(D) competition within the population for living space
(E) native predators that hunt and kill species members

Biology

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