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Lab_9_Nematodes - Phylum Nematoda Roundworms Lab 9...

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Lab 9 Roundworms are Tripoblastic, Protostomes classified into Branch Eumetazoa , Domain Eukarya, Kingdom Animalia and Phylum Nematoda . They are Pseudocoelomates ( having a body cavity partially lined by the mesoderm) that reproduce sexually. They produce zygotes that are resistant to harsh conditions. Their body structures are bilaterally symmetrical . Some species are hermaphrodites (produce both male and female gametes). In Dioecious (separate sex) roundworms the female is larger than the male. Round worms are found in moist soil, in the decaying organic matter of lake and ocean bottoms, and as parasites in animals. These worms contribute to nutrient recycling in the environment. Humans become infected with roundworms after consuming undercooked meat infected with young worms. The worms mature in human intestines and reproduce producing more worms which eventually travel throughout the human’s body. They acquire nutrients from their host plant or animal.
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