Pathways Principle CLOZE #2

Target Language or Knowledge:

Adolph learned the importance of focusing on the individuality of children from her mentor, Esther Thelen, the scientist who solved the mystery of the stepping reflex. Adolph has applied this same perspective to her pioneering work on infant development, including crawling. In one study, she and her colleagues tracked the development of twenty-eight infants from before they crawled until the day they walked, examining the data using the “analyze than aggregate” method. Adolph discovered there is no such thing as a normal pathway to crawling. Instead she found no less than twenty-five different pathways infants followed, each with its own unique movement patterns, and all of them eventually led to walking*

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What (kind of) evidence does Adolph use to support her claim?