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Which one of the following pairs of animals comprises ‘jawless fishes’?
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- Mackerals and Rohu
- Lampreys and hag fishes
- Guppies and hag fishes
- Lampreys and eels
Correct Option: B
Lampreys and hagfishes are unusual, jawless fish that comprise the order Cyclostomata, so named because of the circular shape of the mouth. The brains of lampreys and hagfishes differ a lot, but they also show a large number of similarities, as do all craniate brains.
