Bilaterally symmetrical, metamerically segmented animals with a closed circulatory system are included under the phylum
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a
Annelida
b
Arthropoda
c
Mollusca
d
Echinodermata
answer is A.
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Detailed Solution
Annelids are bilaterally symmetrical, metamerically segmented animals with a closed circulatory system.Arthropods have an open circulatory systemMolluscs are unsegmented and most of them have an open circulatory system.Echinoderms are unsegmented and are radially symmetrical in the adult stage.