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Anonymous
Scientists must rely on estimates when they cannot obtain exact numbers.
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estimate
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They rely on there conclusions based on Observations.
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Scientists rely primarily on the fossil record to determine evolutionary history. Another way of determination is examining the genetic record.
Biology!
an approximation.
Scientists use the severity of damage that a tornado causes to estimate wind speed.
Because
Biology
They rely on there conclusions based on observations.
Scientists estimate the age of Earth to be around 4.5 billion years old. This estimate is based on the analysis of radiometric dating of rocks and meteorites.