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        Living Together: Parasites and Hosts | Smithsonian Science How

        Learn about parasites and how they are important members of ecosystems. Meet Dr. Anna Phillips, a zoologist at the National Museum of Natural History. Parasites make up as much as 60 percent of biomass, and have complex relationships with the host organisms they depend on. See what Anna discovers about how parasites such as leeches and tapeworms relate to their hosts. Consider the significant roles parasites play in our lives and ecosystems. Gain a new perspective on parasites.

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