Case Histories:
Bison in North America 
Dinosarus: 
The Dinosauria  and More Dinos
Dinosaur fossils
Controversies on extinction
Comets
Read the Five Current Theories on the extinction of dinosaurs and make own decision and vote for the one you favor.
For Extra Credit: send your comments to the Instructor: What do you think? Which of the theories do you think best explains the data you collected about the extinction of the dinosaurs? 
Human Evolution