During the course of evolution, metamerism is first observed in the phylum
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a
Annelida
b
Arthropoda
c
Mollusca
d
Aschelminthes
answer is A.
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Detailed Solution
In the course of evolution, annelids are the first ever organisms to exhibit metamerism.Arthropoda also exhibit metamerism (segmentation).Platyhelminthes and Mollusca do not exhibit metamerism.