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. Which of the following statements about the two populations in supported by the graph?
a. the reproductive rate of the wolves was greater than the reproductive rate of the moose
b mutualism allowed the two populations to reproduce while occupying the same ecological niche
c. speciation occurred when the two populations between reproductively isolated from each other
d. The wolves were predators of the moose, which were otherwise reproductively successful
Answer: D