What describes the term parasitism?

Parasitism is a kind of symbiosis, a close and persistent long-term biological interaction between the parasite and its host.Unlike commensalism and mutualism, the parasitic relationship harms the host, either feeding on it or, as in the case of intestinal parasites, consuming some of its food

Example a tick and a dog

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the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus