Question

Why reptiles and birds are known as oviparous and cows are known as viviparous​

Answer 1

Answer:

All egg-laying animals/mammals are oviparous animals, and this feature is called oviparity. ... Example: All birds are egg-laying, egg-laying mammals are Echidna and Platypus, reptiles, amphibians, fishes. Viviparous animals are the ones that give birth to their off-springs directly.

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Answer 2

Viviparous animals are those in which fertilization and embryo development occur inside the individual. Humans are viviparous. Mammals such as cows, monkeys, chimpanzees are viviparous.

Oviparous animals are animals that lay their eggs, with little or no other embryonic development within the mother. In traditional usage, most insects (one being Culex pipiens, or the common house mosquito), molluscs, and arachnids are also described as oviparous.