I believe that the answer to the question provided above is that that tertiary and quaternary periods have greater resolution in their subdivisions (epochs) than the periods composing the paleozoic era because of the sudden changes of the <span>tertiary and quaternary periods it is subdivided.</span>
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It's called <span>Currency appreciation.</span>
1. great wall
2. qin rule begins
3. qin conquered other states and united china
4. qin dynasty end
5. civil war breaks out
