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Nematodes-beings-morphology-kind of symmetry

Explain the characterization of nematodes according to illustrations of representing beings, fundamental morphology, kind of symmetry, germ layers and coelom, respiratory system, digestive system, excretory system, circulatory system, nervous system and kinds of reproduction?

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Illustrations of representing beings: hookworms, ascaris, filaria and pinworms. Fundamental morphology: cylindric (or round) body not segmented. Kind of symmetry: bilateral. Germ layers and coelom: triploblastics and pseudocoelomates. Digestive system: complete. Respiratory system: respiration through diffusion. Circulatory system: circulating fluid in the pseudocoelom. Excretory system: excretory pore and excretory and. Nervous system: ventral and dorsal ganglial chord, primitive cephalization. Kinds of reproduction: sexual.

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