acquired characteristic - A characteristic that can change during life, due to a change in the environment. (See also environmental variation.), continuous variation - Continuous data can take any value between two limits. Examples include length, mass, time, discontinuous variation - Data values that can only have one of a set number of options are discontinuous. Examples include shoe sizes and blood groups, environmental variation - Differences between organisms caused by environmental factors, such as amount of heat, light, damage. These differences are called acquired characteristics., genetic variation - Differences between organisms caused by differences in the alleles they inherit from their parents, or differences in genes caused by mutation., mean - An average calculated by adding up the values of a set of measurements and dividing by the number of measurements in the set., median - The middle value in a data set., mode - The most common value in a data set., normal distribution - When many individuals have a middle value for a feature, with fewer individuals having greater or lesser values. This sort of data forms a bell shape on charts and graphs., range - The difference between the highest and lowest values in a set of data (usually ignoring any outliers or anomalous results).,

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