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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 answer: Whales, Dolphins, Seals

Solution

Whales, dolphins, and seals are all mammals adapted to aquatic life: they breathe air, are warm-blooded, and feed their young with milk. Trygon is a ray and sharks are fish, so those options are not fully aquatic mammals.

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