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Biology
Deborah Graham

Which of the following first apperead innematodes :1)brain 2)pseudometamerism 3)body cavity 4)blood vascular system ​

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Nematodes are roundworms and belong to the phylum Nematoda and more than half of the identified species are parasites on plants, animals and even humans. Dracunculus medinensis ( Guinea worm) is a large, thin and threadlike nematode growing up to 1 m long was recorded by the early Egyptian physicians between 1553- 1550 BC , the information which was obtained by the German Egyptologist in 1872.

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