32VariationMedium1 markThe graph shows the percentages of the global population with the four different blood groups in the ABO system.What can be concluded from the graph?AABO blood groups show the same variation as body mass.BABO blood groups are an example of discontinuous variation.CThe variation in ABO blood groups results in a range of phenotypes between two extremes.DVariation in ABO blood groups is caused by genes and the environment.Grade answerGrading criteria