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Describe what a parasite is?
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Describe what a parasite is?

User Gleb Belyaev
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A parasite is an organism that lives on or in a host organism and gets its food from or at the expense of its host. There are three main classes of parasites that can cause disease in humans: protozoa, helminths, and ectoparasites.
User Jmeinlschmidt
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