According to this evolutionary tree, the archaea and eukaryotes last shared a common ancestor ________. 
Definitions:
Random Variable
A variable that can take on numerical results from a random event or experiment.
Standard Deviation
An indicator of the spread of a dataset relative to its mean, used to quantify the degree to which individual data points differ from the average.
Monthly Production
The total output or production of a manufacturing process or facility in a single month.
Probability Distribution
Describes how the values of a random variable are distributed, showing the probabilities of different outcomes occurring.
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