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.