It begins at the base of the tree the common ancestor. And it ends when you the organism or group with the greatest number of shared derived characteristics.
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A tree diagram for 2 dice is not a sensible approach to the question. You have the starting point from which there are six primary branches representing the six possible outcomes for the first die. Then, from each of these end-points there are six secondary branches representing the outcomes for the second die. This makes a total of 36 secondary branches and no sensible person would draw such a tree diagram: a 6x6 table is a much better way to represent the outcome space.
"Beginning."
A polygon, by definition, is a CLOSED plane shape, bounded by straight sides. Every polygon must begin and end at the same point.
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Feb 2036