You are given leech, Nereis, Scolopendra, Prawn, and Scorpion; and all have segmented body organization, 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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Solution

Though leech, Nereis, Scolopendra, prawn, and scorpion possess segmented body organization, yet they do not belong to the single group.
Leech and Nereis, belong to the phylum Annelida because they have a metamerically segmented body i.e., the body is divided into more or less similar types of segments and external segmentation corresponds to the internal segmentation i.e. body cavity is also segmented through septa. Their locomotory organs are either suckers, as in leech or parapodia, as in Nereis. They possess a close blood vascular system and their excretory organs are nephridia.
On the other hand, Scolopendra, prawn, and scorpion belong to phylum Arthropoda, as they possess jointed legs, chitinous body covering, open blood vascular system and tracheal system for respiration.

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