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B
Shell
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C
Dermal scales
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D
Test or tunic
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Solution
The correct option is D Test or tunic Urochordata is also called as Tunicata or tunicates. The term tunicates has been derived from the unique outer covering or tunic. The tunic is formed from proteins and carbohydrates. The tunic acts as an exoskeleton. The tunic is also referred as test.