<span>This type of a relationship where only one species benefits and the other is harmed is known as parasitism. The other species is not killed immediately, at least not as long as the first species, or the parasite, needs them. As long as the victim provides enough sustenance for the parasite to live, they will be necessary and not killed off. The moment the victim has nothing else to offer to the parasite, it is probably going to die.</span><span />
