1. End Show Slide 1 of 25 Copyright Pearson Prentice Hall Biology

2. End Show Slide 2 of 25 Copyright Pearson Prentice Hall 32-2 Diversity of Mammals

3. End Show 32-2 Diversity of Mammals Slide 3 of 25 Copyright Pearson Prentice Hall Diversity of Mammals The three groups of living mammals are: monotremes marsupials placentals

4. End Show 32-2 Diversity of Mammals Slide 4 of 25 Copyright Pearson Prentice Hall Monotremes and Marsupials Monotremes Monotremes lay eggs. Monotremes share two notable characteristics with reptiles: The digestive, reproductive, and urinary systems all open into a cloaca. Females lay soft-shelled eggs that incubate outside the body.

5. End Show 32-2 Diversity of Mammals Slide 5 of 25 Copyright Pearson Prentice Hall Monotremes and Marsupials Only three species of monotremes exist today: the duckbill platypus and two species of spiny anteaters, or echidnas. These animals are found in Australia and New Guinea.

6. End Show 32-2 Diversity of Mammals Slide 6 of 25 Copyright Pearson Prentice Hall Monotremes and Marsupials Marsupials Marsupials bear live young, but at a very early stage of development. Young marsupials complete their development in an external pouch.

7. End Show 32-2 Diversity of Mammals Slide 7 of 25 Copyright Pearson Prentice Hall Placental Mammals Placental mammals are named for an internal structure called the placenta, which forms when the embryo's tissues join with tissues from within the mother's body.

8. End Show 32-2 Diversity of Mammals Slide 8 of 25 Copyright Pearson Prentice Hall Biogeography of Mammals How did convergent evolution cause mammals on different continents to be similar in form and function?

9. End Show 32-2 Diversity of Mammals Slide 9 of 25 Copyright Pearson Prentice Hall Biogeography of Mammals Similar ecological opportunities on the different continents have produced some striking examples of convergent evolution in mammals. Landmasses merged in the late Cenozoic, and mammals dispersed into new habitats. Living mammals reflect the diversity that resulted.

10. End Show 32-2 Diversity of Mammals Slide 10 of 25 Copyright Pearson Prentice Hall Biogeography of Mammals Convergent Evolution in Mammals Giant Anteater Aardvark Common Echidna Chinese Pangolin Nine-Banded Armadillo

11. End Show 32-2 Diversity of Mammals Slide 11 of 25 Convergent Evolution Copyright Pearson Prentice Hall

12. End Show - or - Continue to: Click to Launch: Slide 12 of 25 Copyright Pearson Prentice Hall 32-2

13. End Show Slide 13 of 25 Copyright Pearson Prentice Hall 32-2 Most mammals are a.monotremes. b.marsupials. c.placental mammals. d.placental marsupials.

14. End Show Slide 14 of 25 Copyright Pearson Prentice Hall 32-2 Monotremes are the only group of mammals that a.lay eggs b.have hair. c.feed their young with milk. d.are endotherms.

15. End Show Slide 15 of 25 Copyright Pearson Prentice Hall 32-2 Ant-eating mammals on different continents look similar to each other because they are all a.a result of divergent evolution. b.adapted to similar ecological opportunities. c.recently evolved from a common ancestor. d.evolved from an ant-eating reptile.

16. End Show Slide 16 of 25 Copyright Pearson Prentice Hall 32-2 What is the function of the placenta? a.production of milk b.exchange of materials between fetus and mother c.digestion of food d.protection of a young mammal after birth

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