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13 Cards in this Set
- Front
- Back
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Describe the characteristics of placental mammals.
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A placental mammal carries its young inside the uterus until development is nearly complete.
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Compare monotremes and marsupials.
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Monotremes lay eggs. Marsupials give birth to immature young that continue development in the mother’s external pouch.
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Why are monotremes classified as mammals?
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They have other mammalian characteristics, such as hair and mammary glands
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What are therapsids and what is their relationship to mammals?
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Therapsids are the reptilian ancestors of mammals.
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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?
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Marsupials developed in South America and Australia, continents in Gondwana; Europe was part of Laurasia. There are no marsupials in Europe.
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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.
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placental mammals
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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?
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It is an herbivore that can run fast. It may have multiple stomachs and chew cud.
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in females, the hollow, muscular organ in which the offspring of placental mammals develop.
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uterus
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organ that provides food and oxygen to and removes waste from young inside the uterus of placental mammals.
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placenta
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time during which placental mammals develop inside the uterus.
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gestation
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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.
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marsupial
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subclass of mammals that have hair and mammary glands but reproduce by laying eggs.
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monotreme
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reptilian ancestors of mammals that had features of both reptiles and mammals.
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therapsids
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