Bateman gradients are calculated by estimating the slope of best-fit lines when what two variables are plotted against one-another?   a. Number of mates on the x axis, number of offspring on the y axis   b. Number of mates on the x axis, time on the y axis   c. Time on the x axis, number of offspring on the y axis   d. Number of eggs on the x axis, number of offspring on the y axis

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