Which among the following animals are not oviparous?

Platypus

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Spiny ant eater

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T-Rex

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Dolphin

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Solution

The correct option is D Dolphin
All mammals are viviparous except platypus and spiny ant eater which are oviparous. Reptiles and birds are predominantly oviparous. Dolphins, even though resemble fishes, are mammals but are not oviparous. They are viviparous. T-Rex is a reptile and is oviparous.

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