Complete the sentence about Xoloitzcuintle with the correct year: A ______ genetic study using mitochondrial DNA found that the DNA sequences of the Xoloitzcuintle were identical to those of dogs from the Old World.
Answer and explanation
Correct answer: C. 1999
A 1999 genetic study using mitochondrial DNA found that the Xoloitzcuintle's DNA sequences were the same as those of other dogs.
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