What are mammals classified based on?
Give birth to young that have developed inside the mother's uterus until their body systems are fully functional and can live independently
What percent of mammals are placental?
Hollow, muscular organ where the embryo develops
Organ that develops during pregnancy that provides nourishment to the embryo
Time in which the embryo develops inside the uterus
(1) Mammal in which the young have a short period of development within the mothers body. (2) Followed by a period of development inside a pouch made of skin on the outside of the mother's body
What is the only North American marsupial?
Australia and surrounding islands
Where are most marsupials found?
What do marsupials fill in that placental animals fill in other parts of the world?
A mammal that reproduces by laying eggs
Duck-billed platypus, echidna
What are two examples of monotremes?
Australia, Tasmania, New Guinea
Where are monotremes only found?
How many species total are there of monotremes?