Answer:
All
organisms given in the question do not belong to same group. Leech and Nereis
belong to phylum annelida because they have metamerically segmented body, i.e.,
body is divided into many segments internally by septa. Body segments are lined
up one after the other from head to tail. But Scolopendra, prawn and scorpion
belong to phylum arthropoda as these have jointed legs and open circulatory
system.
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