Multiple Choice
The increase in atmospheric oxygen during the Proterozoic was most related to the ____.
A) decrease in global volcanism
B) decrease in ocean sizes
C) process of photosynthesis by bacteria
D) appearance of land plants
E) origin of complex life forms
Correct Answer:
Verified
Correct Answer:
Verified
Q20: All known Proterozoic animals were soft-bodied.
Q21: The oldest well-documented stromatolites occur in the
Q22: What are the two major rock types
Q23: Glacial deposits, as well as striated and
Q24: The large Proterozoic landmass known as Laurentia
Q26: What are prokaryotic organisms?
Q27: Briefly explain the difference between the tectonic
Q28: Earth differentiated during the _.<br>A)Hadean<br>B)Archean<br>C)Paleoproterozoic<br>D)Mesoproterozoic<br>E)Neoproterozoic
Q29: Time divisions in the Precambrian are based
Q30: The Precambrian comprises what percent of geologic