Question

define viviparous animals and oviparous animals
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Answer 1

Answer:

The main difference between oviparous and viviparous animals is that oviparous animals do not undergo any embryonic development inside the mother whereas viviparous animals develop into a young animal inside the mother. This means oviparous animals lay eggs.  Most mammals are viviparous animals.

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Explanation:

Answer 2

Viviparous And Oviparous Animals

Animals can be divided into two types based on how they give birth to their young ones.

Animals that give birth to young ones are called viviparous animals. Mammals like dog, cat, horse and human beings are the examples of viviparous animals.

Animals that lay eggs and hatch them into offsprings are known as oviparous animals. The examples of oviparous animals are snakes, butterflies, frogs and birds.

In oviparous animals like hens, an embryo develops in a different manner. After fertilisation, when the zygota in matured enough, it divides repeatedly. The zygota then travels down the oviduct and several ptotective layers starts farming around it. The hen starts laying the eggs as soon as the hard shell is formed around the embryo. The hen then gives warmth to the eggs by sitting over them. Development of the chicks starts taking place inside the shells. It takes about three weeks for the embryo in order to develop into a chick. The eggs shells burst open once the chicks get matured enough to come out.