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).
For more information about the topic Roundworm, read the full article at Wikipedia.org, or see the following related articles:
Editor's Note: This article is not intended to provide medical advice, diagnosis or treatment.
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