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BookmarkThe roundworms or nematodes are one of the most common phyla of animals.
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They are ubiquitous in freshwater, marine, and terrestrial environments.
Further, there are a great many parasitic forms, including pathogens in most plants and animals, humans included.
Most free-living nematodes are microscopic, though a few parasitic forms can grow to several meters in length (typically as parasites of very large animals such as whales)..
For more information about the topic Roundworm, read the full article at Wikipedia.org, or see the following related articles:
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Cuttlefish — Cuttlefish are animals of the order Sepiida, and are marine cephalopods, small relatives of squids and nautilus. Cuttlefish have an internal shell, ... > read moreNote: This page refers to an article that is licensed under the GNU Free Documentation License. It uses material from the article Roundworm at Wikipedia.org. See the Wikipedia copyright page for more details.
