The emphasis will be on what event led to the conclusion of the time period.
During the Precambrian, all life forms were restricted to the oceans. predominant vegetation types, etc.
The Cambrian Explosion brought the Precambrian to a close. The emphasis will be on what event led to the conclusion of the time period.
What position were the continents in during the geologic period? How did their positions influence climate?
List all groups of organisms, plants, animals, fungi, etc. that had significant radiations in numbers of species. Also, HOW did these radiations influence organisms around them?
What groups were influenced by extinctions during the geologic period? What hypotheses are there to explain these extinctions?
Where in the world are fossils of this time period collected? Who are the major authorities in primary literature on this geologic period?
A list of works cited.