Consider the nematode roundworm, the most abundant of all animals.

For example, studies of Caenorhabditis elegans, a tiny roundworm, have provided a wealth of information on cellular differentiation, neural networks, meiosis, and programmed cell death.

Intestinal parasites such as roundworm, whipworm, and hookworm strip iron from sufferers’ guts, causing disease and intellectual retardation.

Many parasites are worms: hookworm (800 million people infected), roundworm (1.5 billion), schistosomes (200 million), and the worm that causes Elephantiasis (150 million).

For example, single-gene changes can double the lifespan of the small roundworm C. elegans, the animal in which such genes were first identified, and they have extended the lifespan of mice, which are mammals like us, by up to 50%.

Roundworm in sentence

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