The geologic time scale is broken up into time units of different sizes based on
A) eons,eras,periods,and epochs.
B) changes in fossilization.
C) visible and nonvisible life forms.
D) major changes in life forms.
Correct Answer:
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Q64: The Precambrian witnessed the development of
A)the first
Q65: Earth's first atmosphere was rich in water
Q66: Which of the following is not true
Q67: From first to last,name the eons on
Q68: In dating a mineral,what is meant by
Q70: What are some of the uncertainties in
Q71: Why are periods the most fundamental time
Q72: What are the limitations in obtaining radiometric
Q73: Life forms in the Precambrian included
A)trilobites.
B)brachiopods.
C)coelacanths.
D)cyanobacteria.
Q74: Life forms in the Precambrian include
A)trilobites,brachiopods and
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