Understanding Key Concepts

4. Identify six key characteristics of mammals.

5. Relate the characteristics of therapsids and synapsids to those of mammals.

6. Relate the evolution of mammals to the mass extinction of Cretaceous reptiles.

7. Compare the costs and benefits of endothermy for mammals.

8. Explain how the structure of the mammalian heart supports endothermy.

9. Describe the important adaptations of the teeth of mammals.

10. Compare the teeth of rodents to those of lagomorphs.

11. Describe two mammalian adaptations for digesting plants.

12. Identify the part of the brain that is relatively larger in mammals than in other animal groups.

13. Describe the distinguishing characteristic of placental mammals.

14. Give an example of an animal from each of the 12 orders of placental mammals.

15. Compare the characteristics of artiodactyls and perissodactyls.

16. Compare sirenians, pinnipeds, and cetaceans.

17. Describe the distinguishing characteristics of primates.

18. Compare fossil australopithecines with fossil humans.


CONCEPT MAPPING Use the following terms to create a concept map that compares the process of reproduction in different animal groups: reptiles, monotremes, marsupials, placental mammals, oviparous, viviparous, and placenta.

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