(D) Whales are exclusively viviparous. In viviparous animals (the majority of mammals,including human beings),the zygote develops into a young one ins

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(D) Whales are exclusively viviparous. In viviparous animals (the majority of mammals,including human beings),the zygote develops into a young one inside the body of the female organism.After attaining a certain stage of growth,the young ones are delivered out of the body of the female organism.