Meghan explains to zach the difference between commensalism, mutualism and parasitism. which sentence(s) did she include in her explanation? select all that apply. a.) a mutualistic relationship benefits only one of the species. b.) in commensalism, one species is unaffected by the relationship. c.) parasitism involves a parasite and a host. d.) mutualism is a relationship in which one species preys upon another. e.) commensalism is a relationship between two species that compete with each other.