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B
lamprey
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C
rohu
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D
both a and b
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Solution
The correct option is B lamprey The maximum number of gill slits are present in cyclostomes. Cyclostomes have 6-15 pairs of gill slits. Lampreys are examples of cyclostomes. Sharks have 5-7 pairs of gill slits. Rohu is a bony fish. Bony fishes have 4 pairs of gill slits.