Home >> Flashcards >> Biology >> Ch 32 Mammals - Dr. Sharp
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| Characteristics of mammals: |
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Definition
1. have hair
2. ability to nourish their young with milk
3. breathe air
4. have four chambered heart
5. are endotherms that generate their own body heat |
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- first true mammals appeared 220 million years ago
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| organ in placental animals through which nutrients, oxygen, carbon dioxide, and wastes are exchanged between embryo and mother |
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| mammal which bears live young that complete their develpoment in an exteranl pouch |
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Name the three groups of mammals and how they differ(give an example of each):
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1. Monotremes - lay eggs (ex. duckbill platypus, anteater, and echidnas)
2. Marsupials - immature young finsih developing in marsupium (ex. kangaroos, koalas, and wombats)
3. Placental mammals - embryo, supported by the placenta, develops completely inside mother (ex. mice, whales, elephants and humans) |
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