[Solved] It has been suggested that the fraternal birth-order effect is a result of A) erotic plasticity. B) refractory periods. C) a maternal immune response. D) mass-media norms. Allman Brothers: The Allman Brothers Band was an influential American rock band known for their contributions to the development of Southern rock music in the 1970s. Slope: The measure of the steepness or incline of a line, often defined as the ratio of the vertical change to the horizontal change between two points on the line. Regression Line: A line of best fit through a scatterplot of data points in statistical analysis, representing the relationship between an independent variable and a dependent variable. Contestant: An individual who takes part in a competition or contest.