The graph above represents the number of individuals in a population of wolves and in a population of moose observed in the same isolated geographic area over a 40-year period, from 1955 through 1995. Which of the following statements about the two populations is best supported by the information presented in the graph?

The figure shows a relatively common predator-prey relationship. When the moose population is abundant, the predator population grows. However, an increase in wolves leads to a reduction in the moose population through predation. This cycle oscillates unless disturbed by extreme external factors.