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Ornithorhynchus is an example of

1. Dinosaur
2. Monotreme mammal
3. Marsupial mammal
4. Eutherian mammal

Correct answer: Monotreme mammal

Solution

Ornithorhynchus is the genus of the platypus, which is an egg-laying mammal. Egg-laying mammals are monotremes, so it is a monotreme mammal rather than a marsupial or eutherian.

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