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Metameric segmentation (true serial body segmentation with repetition of organs) characterises phylum:
APlatyhelminthes
BMollusca
CAnnelida (e.g. earthworm; the name 'annulus' = little ring)
DAschelminthes
Answer & Solution
Correct answer: C. Annelida (e.g. earthworm; the name 'annulus' = little ring)
Annelida (Latin annulus = ring) shows metamerism — body internally and externally divided into segments with repeated organs (nephridia, ganglia, gonads etc). Earthworm Pheretima is the classic example; Nereis and Hirudinaria (leech) are other annelids.
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