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You are given leech, Nereis, Scolopendr...

You are given leech, Nereis, Scolopendra, prawn and scorpion, and all have segmented body organisation. Will you classify them in one group? If no, give the important characters based on which you will separate these organisms into different groups.

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Leech, Neries, scolopendra, prawn and scorpoion belong to different groups. (i) Nereis and leach have metameric segmantation, closed circulatory system and unojointed appendages. They belong to Annedlida phylum.
(ii) Scolopendra, prwan adn scropion belong to phylum Arthropoda beause they have open circulatory system and jointed appendages.
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