Geology Reference
In-Depth Information
13. Discuss the signifi cance of the appearance of the fi rst
shelled animals and possible causes for the acquisition
of a mineralized exoskeleton.
14. Discuss how the incompleteness of the fossil record
may play a role in such theories as the Cambrian explo-
sion of life.
15. Discuss how changing geologic conditions affected the
evolution of plants and vertebrates.
16. Describe the problems that had to be overcome before
organisms could inhabit and completely colonize the
land.
17. What are the major differences between the seedless
vascular plants and the gymnosperms, and why are
these differences signifi cant in terms of exploiting the
terrestrial environment?
18. Why were the reptiles so much more successful at
extending their habitat than the amphibians?
19. Outline the evolutionary history of fi sh.
20. Discuss some of the possible causes for the Permian
mass extinction.
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