Ultimately there is no evidence to definitively prove either hypothesis. There is no known accurate historical or archaeological evidence that definitively resolves the question. How they choose mates has not been definitively determined. He publicly denounced the UN as unwilling to definitively resolve the human crisis there. "Trypanosoma cruzi" in a patient, which therefore makes it difficult to definitively make a diagnosis. A systematic review concluded no data exists to definitively link metformin to lactic acidosis. Quite who Mother Shipton was or what exactly she said is not definitively known. There are few neuropsychological assessments that can definitively diagnose prosopagnosia. Aristotle went on to say it was a definitively human activity. It's hard to say definitively which writers are New Journalists. This reflects the inherent problem of estimating pixels that are not definitively known. In 1905, Albert Einstein explained Brownian motion in a way that definitively proved atomic theory. But now he moved more definitively into anthropology. Deep tissue biopsies are required to definitively diagnose dermatomyositis. Amash was the only Republican who said "definitively he would support impeachment".