The ability of a teacher to motivate students and facilitate learning affects each student's educational attainment, perhaps more than any other single characteristic of schooling. (cepa.stanford.edu)
The model was designed to illustrate one single characteristic of CO2, that being how it reacts with long wave radiation in the context of the «greenhouse effect». (wattsupwiththat.com)
According to the Newfoundland Club of America in the breed standard, «Temperament: Sweetness of temperament is the hallmark of the Newfoundland; this is the most important single characteristic of the breed.» (pawster.com)