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B
Duck-billed platypus
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C
Whale
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D
Rabbit
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Solution
The correct option is B Duck-billed platypus Mammals are mainly viviparous. But, there are some exceptions, such as the duck-billed platypus, which is a semiaquatic egg-laying mammal. It is endemic to the Australian region. Another example of an oviparous mammal is the spiny ant-eater.