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Which of these marine animals is a mammal?
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Seahorse
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Shark
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Octopus
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Dolphin
That's Correct!
It's Wrong!
The correct answer is "Dolphin". Marine mammals are warm-blooded, air-breathing animals that typically give live birth and nurse their young with milk. Examples include dolphins, whales, and seals. In contrast, sharks are fish, octopuses are cephalopods, and seahorses are also fish. These other marine animals do not share the distinctive mammalian characteristics of warm-bloodedness and lactation.
