Explanation:Parasitism:Parasitism is a relationship between two species where the smaller species usually harms its host or takes nutrients from the host.This species is called a "parasite."On the other hand, the species that harbour the parasite is called the host.This process in which the host body is harmed by parasites is called parasitism.Examples: A wasp parasitizing a pupa of a housefly. Thus, the relationship between organisms where one organism benefits from the association while the other is harmed is known as parasitism. Additional InformationSymbiosis:Some organisms live together and share shelter and nutrients. This is called a symbiotic relationship. For example, certain fungi live in the roots of trees. Mutualism:Mutualism refers to a relationship in which both partners are dependent on each other.In this kind of relationship, both species benefited from each other.Example: In plants, fungi and algae show a mutualistic relationship where the fungi protect the algae. In return, it gets food from algae.Competition:Competition is defined as a process in which the fitness of one species is significantly lower in the presence of another species.Hare both species struggle for the same resources food, shelter and sex.In this relationship, both components are affected negatively by nature.For example in South American lakes visiting flamingoes and resident fishes compete for their common food, the zooplankton in the lake.