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  1. Which among these is the correct combination of aquatic mammals?
    1. Dolphins, Seals, Trygon
    2. Whales, Dolphins, Seals
    3. Trygon, Whales, Seals
    4. Seals, Dolphins, Sharks
Correct Option: B

Sharks and Trygon (sting ray) are the members of cartilaginous fish while Whale, Dolphin and Seals are aquatic mammals belong to class mammalia.



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