Earthworm , leech , neeris are classified in one group . What are the important characteristics on the basis of which this grouping is done ?
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I guess you mean the phylum. They belong to the phylum annelida.
Characteristics of the phylum annelida are....
1.soft, cylindrical, ring like segmented body.
2.True body cavity present.
3.Alimentary canal opens at 2 ends.
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