MICROANATOMY

Detailed explanation-1: -Almost all mammals give birth to live young but two species, the echidna and the duck-billed platypus, actually lay eggs. Rather than giving birth to fully developed young, some mammals have tiny babies which they keep in a pouch until they are much larger. We call these animals ‘marsupials’

Detailed explanation-2: -Mammals give birth to live young, right? That’s a huge component of what it means to be a mammal. Mammals are hairy, produce milk, are warm-blooded, and give birth to live young…

Detailed explanation-3: -Mammals-a group that include humans-are warm-blooded animals with hair and vertebrates, or backbones. Unlike other classes of animals, female mammals produce milk to nourish their young. Almost all mammals give birth to live young (except for the platypus and echidna, which lay eggs).