Mutualistic relationships among species, such as among plants and pollinating animals: (choose all that apply) a. may be destabilized by the evolution of "cheating" in which one species obtains a benefit from the other without providing benefit in return b. are inherently stable, because the species are likely to become extinct if they do not maintain the mutually beneficial relationship. c. evolve in order to maintain the balance of nature. d. begin with one species evolving to benefit the other, in order to induce the other species to evolve reciprocity. e. show that the notion of “selfish genes” is wrong.