Which factors played a role in the development of early life?
answer these questions 1-2 sentences works or just a few words nothing too long keep it brief
1. Briefly explain the difference between the tectonic setting of shield areas during the Precambrian and since the onset of the Phanerozoic
2. During the Hadean, how long was the length of a day on Earth? Why?
3. the Ediacaran fauna include representatives of the modern phyla _______
4. The Precambrian history of Earth is difficult to determine – why is that?
5. There is chemical evidence that life appeared by ________ and fossils by ________. (Looking for years before present, how long ago)
6. Besides the origin of life itself, what was the most significant biological event of the Archean?
7. No rocks are known for the first _________ years of Earth history.
8. What are prokaryotic organisms?
9. What are time divisions in the Precambrian based on?
10. What do the Ediacaran fauna represent, and why are they important?
11 .What does the appearance of red beds in the geologic record indicate about the atmosphere?
12 .What factor(s) led to the enormous scale of banded iron deposition during the Proterozoic?
13. What two processes, which began during the Archean, can account for the introduction of free oxygen into the atmosphere?
14. Which factors played a role in the development of early life?
15.Why is it believed that cyanobacteria must have been preceded by even simpler organisms?
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