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12/7/2016
Figure 21.18a
Figure 21.18b
Sugar
glider
© 2014 Pearson Education, Inc.
Flying squirrel
© 2014 Pearson Education, Inc.
Figure 21.19
The Fossil Record
 The fossil record provides evidence of the
extinction of species, the origin of new groups, and
changes within groups over time
© 2014 Pearson Education, Inc.
Most mammals
Cetaceans and even-toed ungulates
(a) Canis (dog)
(b) Pakicetus
© 2014 Pearson Education, Inc.
(c) Sus (pig)
(d) Odocoileus (deer)