Parasites can live in or on their hosts, they benefit themselves from their hosts and usually kill their hosts and hosts are harmed by parasites this is called parasitism.
What is Parasitism?
A parasitism is a kind of symbiotic relationship in which two species lives in close association. In this association one species is benefited by harming the other species so as to derive nourishment and shelter. The species which causes harm is called as the parasite the species which is being harmed is called as host. In parasitism the parasitic as well as the host species evolve together. The parasite is adapted to live in the host body in adverse conditions too. Also the host is adapted to get rid from the parasite and attain a protection from the parasitic damage.
Therefore, first, second, fourth and sixth statements are correct.
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