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Roundworm

The roundworms or nematodes are one of the most common phyla of animals.

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).

Note:   The above text is excerpted from the Wikipedia article "Roundworm", which has been released under the GNU Free Documentation License.
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May 30, 2015

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