Which of the choices below is the best comparison of commensalism with parasitism?
a) in both commensalism and parasitism, one organism benefits from the interaction. however, only in commensalism do both organisms benefit.
b) in both commensalism and parasitism, one organism is harmed. however, only in parasitism do both organisms live in close physical proximity.
c) in both commensalism and parasitism, one organism is not affected by the interaction. however, only in parasitism is one organism harmed.
d) in both commensalism and parasitism, organisms live in close physical proximity and one benefits from the interaction. however, only in parasitism is one organism harmed.