What substitution reaction mechanism is most likely for the following conversion? 
Definitions:
Million Years
A period of time equal to one thousand times one thousand years, often used to denote significant periods in Earth's geological and biological history.
Hominoids
A group of primates that includes all apes and humans, characterized by their lack of a tail and more complex brains.
Toumai
A nickname for Sahelanthropus tchadensis, one of the oldest known species in the human lineage, discovered in Chad, Africa dating to about 7 million years ago.
Orrorin
An early hominin genus dating back to about 6 million years ago, speculated to be among the first bipedal primates.
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