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Ch 32 Mammals - Dr. Sharp
Introdution and Diversity
6
Biology
9th Grade
05/14/2009
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Term
Characteristics of mammals:
 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
Term
Mammal evolution:
 Definition

- first true mammals appeared 220 million years ago

-
Term
placenta
 Definition
organ in placental animals through which nutrients, oxygen, carbon dioxide, and wastes are exchanged between embryo and mother
Term
monotreme
 Definition
egg-laying mammal
Term
marsupial
 Definition
mammal which bears live young that complete their develpoment in an exteranl pouch
Term

Name the three groups of mammals and how they differ(give an example of each):

1.

2.

3.

 

 Definition

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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