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They feed on bacteria, single-cell algae, fungi or other nematodes; they can also parasitize other animals or plants.

But the most striking fact about them is their ability to adapt.

The best-known species are commonly called tapeworms.

All cestodes are parasitic and their life histories vary, but typically they live in the digestive tracts of vertebrates as adults, and often in the bodies of other species of animals as juveniles.

saginata), and fish (Diphyllobothrium spp.), or if they live in, or eat food prepared in, conditions of poor hygiene (Hymenolepis or Echinococcus species). saginata, the beef tapeworm, can grow up to 20 m (65 ft); the largest species, the whale tapeworm Polygonoporus giganticus, can grow to over 30 m (100 ft).

Species using small vertebrates as hosts, though, tend to be small.

An interesting situation arises when only one sex of an alien dioecious plant is imported into the UK.

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In some species, the scolex is dominated by bothria, or "sucking grooves" that function like suction cups.Over a thousand species have been described, and all vertebrate species may be parasitised by at least one species of tapeworm.Humans are subject to infection by several species of tapeworms if they eat undercooked meat such as pork (Taenia solium), beef (T.In its native Argentina, about half the plants are hermaphrodite and about half are female, but the hermaphrodite plants apparently don't put much effort into producing seeds.In other words, hermaphrodites are effectively male and thus pampas grass is effectively dioecious.

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