Answer:
By running them under water. The water will separate the rocks from the dirt.
Using a molecular clock, scientists are able to estimate the amount of time that two species have been evolving independently.
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When Linnaeus developed his system of classification, there were only two kingdoms, Plants and Animals. But the use of the microscope led to the discovery of new organisms and the identification of differences in cells. A two-kingdom system was no longer useful. Today the system of classification includes six kingdoms.
DNA to RNA: ACCUUCAGCUCCA