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The muscles associated with each setal/ ...

The muscles associated with each setal/ setigerous sac respectively is 

A

one pair of protractor muscles and a retractor muscle

B

one pair of protractor muscles and one pair of retractor muscles

C

one protractor muscle and one pair of retractor muscles

D

one protractor muscle and one retractor muscle

Text Solution

Verified by Experts

The correct Answer is:
A
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