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Safely simulate the distribution of blood types in a given population. Students determine the ABO and Rh blood types of unknown simulated blood samples and pool their class data to calculate the frequency of each blood group in a given population. Various scenarios can be set up to simulate the blood group distribution in over a dozen populations. Additionally, students can study the composition of blood by preparing a simulated blood smear. The smear is examined under the microscope to locate and identify simulated red blood cells and white blood cells, as well as estimate the number of simulated blood cells in a given sample. Class size - 40 students.