In the list of animals given below, the frog is the odd one out.
Hen, Frog, Lizard, Rat
Identify the reason from the below:

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It is viviparous

It undergoes internal fertilization

It undergoes external fertilization

It is oviparous

answer is D.

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Detailed Solution

A frog is an organism that undergoes external fertilization, which means the fusion of gametes takes place outside the female body.
Whereas hen, lizard, and rat undergo internal fertilization where the fusion of gametes takes place inside the female body.

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