In a Population of Lemmings, a Sudden Freeze That Caused

Multiple Choice

In a population of lemmings, a sudden freeze that caused many of the lemmings to die is an example of a:

A) nonliving and density-independent factor.
B) living and density-dependent factor.
C) nonliving and density-dependent factor.
D) living and density-independent factor.
E) normal boom-and-bust cycle.