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13 Cards in this Set

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Describe the characteristics of placental mammals.
A placental mammal carries its young inside the uterus until development is nearly complete.
Compare monotremes and marsupials.
Monotremes lay eggs. Marsupials give birth to immature young that continue development in the mother’s external pouch.
Why are monotremes classified as mammals?
They have other mammalian characteristics, such as hair and mammary glands
What are therapsids and what is their relationship to mammals?
Therapsids are the reptilian ancestors of mammals.
There are several marsupial species in South America, but only one species is native to North America. Make a hypothesis about the presence or absence of marsupial species in Europe. How could you test your hypothesis?
Marsupials developed in South America and Australia, continents in Gondwana; Europe was part of Laurasia. There are no marsupials in Europe.
mammals that give birth to young that have developed inside the mother's uterus until their body systems are fully functional and they can live independently of their mother's body.
placental mammals
You find a mammal fossil and observe the following traits: hooves, flattened teeth, skeleton the size of a large dog. What can you infer about its way of life?
It is an herbivore that can run fast. It may have multiple stomachs and chew cud.
in females, the hollow, muscular organ in which the offspring of placental mammals develop.
uterus
organ that provides food and oxygen to and removes waste from young inside the uterus of placental mammals.
placenta
time during which placental mammals develop inside the uterus.
gestation
subclass of mammals in which young develop for a short period in the uterus and complete their development outside of the mother's body inside a pouch made of skin and hair.
marsupial
subclass of mammals that have hair and mammary glands but reproduce by laying eggs.
monotreme
reptilian ancestors of mammals that had features of both reptiles and mammals.
therapsids