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B
Musca
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C
Holothuria
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D
Leech
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Solution
The correct option is A Mussels Mussels is a mollusca as it shows bilateral symmetry, has a hard outershell for protection and the body is soft. The diagram along side shows a mussels. Musca is an arthropod, holothuria is an echinodermata, leech is an annelid .