Chapter 13: Geologic Time

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Chapter 13 Geologic Time Journal Questions Pages
366-372
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Question 1 Why are there very few fossils from
Precambrian Time?
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Question 2 How did cyanobacteria help create
the Earths oxygen atmosphere and ozone
development?
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Question 3 Describe the type of animals that
began to develop towards the end of Precambrian
Time.
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Question 4 Describe Earths climate and
animal life during the Paleozoic Era.
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Question 5 Describe how animal life adapted
from water-based organisms to land-based
organisms during the Paleozoic Era.