Sea pens are distinctly different from sea anemones in that sea pens are solitary, while anemones are colonial. the medusa stage of sea pens is mobile, while anemones have a sessile medusa. sea pens are composed of two or more different kinds of polyps, while anemones only have one type. sea pens break down decaying organic matter, while anemones are carnivorous. sea pens contribute to formation of islands and reefs, while anemones destroy them. O O O O

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Parasitic infections

A parasite is an organism that lives in the body of another organism and obtains food at the expense of the host. There are two kinds of parasites they are internal and external. An internal parasite lives inside another organism and is known as endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite.