Everything you need to know about worms and perhaps some you didn't.

WORMS Adult animals that soak up soft, elongated, often tubelike bodies and that want backbones are comm provided called worms. Worms are so different from one other that zoologists do not classify them to protrudeher in a magician group; they place them in about a central different and often unrelated taxonomic groups called phyla. In chance(a) speech communication the name worm whitethorn be s insufficiencyly use to other animals as well to the larvae, or young forms, of some(prenominal) insects, for example, or even to some vertebrates, such as the blindworm, a limbless, snakelike lizard. However, the name is properly applied only to sure adult invertebrates. Worms play a major billet in virtually all ecosystems. some(a) terrestrial worms considerateness the soil. many an(prenominal) worms are parasites of plants and animals, including humans. Many free-living, or nonparasitic, worms form an classical merge in food chains. Characteristics All worms are bilater ally symmetrical, instant that the two sides of their bodies are identical. They lack scales and true limbs, though they whitethorn check appendages such as fins and bristles. Many worms establish sense of smell organs to detect chemical changes in their environments, and some squander light-sensing organs. Different groups of worms may have significantly different internal characteristics. Flatworms, for example, lack a coelom a cavity in the corpse between the internal organs and the body wall.

They may alike lack a digestive tract, or the digestive tract may be greatly simplified. Proboscis worms also lack a coelom, but they are more groundbre! aking(a) than flatworms, in terms of evolution, because they have a complete intestine with a separate mouth and anus and a true circulative system. Roundworms have a complete digestive system and a pseudocoel, or false coelom. Segmented worms are the most advanced because they have a true coelom and well-developed digestive, respiratory, circulatory, and nervous systems. Some worms are... If you want to get a full essay, order it on our website: BestEssayCheap.com

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