Elect one or more: a. Mice have a more stable population size (N) through time when they coexist with voles than in the absence of voles. b. Badgers have a more stable population size (N) through time when they coexist with both mice and voles, rather than with only one of the two species. c. Voles have a more stable population size (N) through time when they coexist with mice than in the absence of mice. d. Voles have a more stable population size (N) through time when they coexist with bison than in the absence of bison. e. Voles have a consistently larger population size (N) when they coexist with mice than in the absence of mice. f. Voles have dramatic swings in population size (N) through time when they coexist with mice than in the absence of mice.