A geologist studies the earth's history.
The answer for One of the defining aspects of mass extinctions in that natural selection forces do not play a role in the outcome is False
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One simple and easy way that scientists can accurately date fossils found is through the ground levels. When you take a big chunk out of the earth, you can see the changes in the texture in the "ground" Each "layer" represents a set of years. And as you get further and further into the ground, fossils become older and older.
