Final answer:
The answer appears contradictory as all of the options provided - frog, platypus, crocodile, and owl - are oviparous since they reproduce by laying eggs. Thus, all options given are technically incorrect because they are all egg-laying animals.
Step-by-step explanation:
The animal among the given options that is not oviparous is the owl. Oviparous animals are those that reproduce by laying eggs, with embryos developing outside the mother's body. The frog, platypus, and crocodile are all oviparous animals. The frog lays eggs, often in water, surrounded by a jelly-like substance for protection. The platypus is a monotreme, a type of mammal that lays eggs rather than giving birth to live young. However, the owl is a bird, and while birds are generally oviparous, the question specified that the comparison is within the context of egg-laying practices. Owls lay eggs, but they are not the correct answer because all the other choices are also oviparous. Therefore, given the context of the question indicating one of the animals does not lay eggs, the answer seems contradictory as they all lay eggs.