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Annelida is a phylum comprising segmented worms, characterized by bodies divided into repeated units and possessing a coelom.

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Annelids are a diverse group of segmented worms found in marine, freshwater, and terrestrial environments.

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Segmented refers to the division of the body into distinct repeating units, as seen in annelids and other organisms like arthropods.

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Coelom refers to the body cavity lined with mesoderm, which contains organs in many animals including annelids.

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Setae are bristle-like structures found on the body of many annelids, aiding in locomotion and burrowing.

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Parapodia are fleshy, paddle-like appendages found on the sides of some annelids, assisting in movement and respiration.

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Hermaphrodite describes an organism possessing both male and female reproductive organs, a characteristic seen in many annelids.

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The clitellum is a thickened glandular region in certain annelids involved in the production of egg cases during reproduction.

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Metamerism refers to the segmentation of the body into repeated units, allowing for flexibility and specialization in annelids.

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Polychaetes are a class of annelids, known for their diverse range of lifestyles and habitats, primarily found in marine environments.

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Oligochaetes are a class of annelids, including earthworms, characterized by fewer setae and simpler parapodia than polychaetes.

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Hirudinea is a class of annelids comprising leeches, which are often specialized for parasitic or predatory lifestyles.

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Regeneration is the process by which annelids and other organisms can grow lost or damaged body parts.

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Symbiosis refers to a mutually beneficial relationship between two different species, which can be seen in some annelids and their symbiotic partners.

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Nematoda is a phylum of roundworms, characterized by their cylindrical body shape and presence of a pseudocoelom.

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Nematodes, commonly known as roundworms, are found in diverse habitats ranging from soil to aquatic environments.

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Parasitic describes the lifestyle of many nematodes, which live off other organisms, often causing harm or disease.

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Pseudocoelomate describes the body plan of nematodes, where the body cavity is not fully lined with mesoderm.

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Cylindrical refers to the elongated, tube-like shape of nematodes, which helps them navigate through soil and other substrate