A) Platyhelminthes - Trematoda - Planaria
B) Echinodermata - Asteroidea - Star fish
C) Arthropoda - Insecta - Spider
D) Mollusca - Cephalopoda - Unio
Correct Answer: B
Solution :
Star fish (Asterias) belongs to class-Asteroidea, sub-phylum-Eleutherozoa, phylum- Echinodermata.
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