Business analysts hoping to provide information helpful to A…

Business analysts hoping to provide information helpful to American lettuce growers compiled these data about lettuce fields​: size ​(square kilometers​), number of years in​ existence, state, varieties of lettuce ​grown, average price per kilogram​, gross​ sales, and percent profit. Specify for each variable whether its use indicates that it should be treated as categorical or​ quantitative, and, for any quantitative​ variable, identify the units in which it was measured​ (or note that they were not​ provided).

A small group of islanders leave “island A” and travel to “i…

A small group of islanders leave “island A” and travel to “island B.” After several generations on island B, a researcher finds that a large percentage of the population is left-handed. Left-handedness is a relatively rare trait on island A. A genetic event that explains this is: