According to this evolutionary tree,the archaea and eukaryotes last shared a common ancestor ________. 
Definitions:
Null Hypothesis
A hypothesis that there is no effect or no difference, and it serves as the default or starting assumption in hypothesis testing.
Point Estimate
A single value (or point) derived from a sample that serves as the best estimate of an unknown population parameter.
Hourly Wages
Hourly wages are payments made to workers based on the number of hours worked, typically quoted as an amount of money per hour.
Margin Of Error
The ± value added to and subtracted from a point estimate in order to develop an interval estimate of a population parameter.
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