What is the difference between the animals that give birth and lay eggs?

Answer 1

Animals that give birth, such as mammals, have internal fertilization where the embryo develops inside the mother's body before being born live. Animals that lay eggs, such as birds and reptiles, have external fertilization where the embryo develops inside an egg outside the mother's body. The main difference is in the way the embryo develops and is nourished during gestation.

Answer 2

Animals that give live birth have adapted the ability to develop a fetus within themselves instead of having to protect an external egg. For the most part, these are mammals, although the Echidna and the Platypus continue to lay eggs. Keep in mind that all sexually reproducing animals lay eggs, just that mammals keep the egg inside of themselves while every other species does not.

Answer 3

Animals that give birth are referred to as viviparous, meaning they carry offspring internally and give birth to live young. Animals that lay eggs are oviparous, meaning they lay eggs externally which then hatch into offspring. Viviparous animals include mammals, while oviparous animals include birds, reptiles, and many fish and invertebrates.

Answer 4

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