In the list of animals given below, hen is the odd one out. Human being, cow, dog, hen. The reason for this is: (a) it undergoes internal fertilization. (b) it is oviparous. (c) it is viviparous. (d) it undergoes external fertilization.
Added by Zachary V.
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On the other hand, hens undergo internal fertilization but lay eggs, which means they are oviparous. Show more…
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