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This lesson is comprised of three parts grouped to enable student understanding of classifying organisms. In part one of the lesson, students classify imaginary organisms represented by a mix of breakfast cereals, candies, nuts, raisins, etc. according to similar characteristics. Students use a flow chart to show the characteristics by which they divided the imaginary organisms into groups. In part two, students classify a series of single-celled organisms using a dichotomous key. In part 3, students apply skills acquired from the previous activities to create a dichotomous key for their specimens from the first activity. These activities are part of an astrobiology guide called the "Fingerprints of Life" which contains background information for the student, worksheets, extension activities, suggested assessments, and alignment to standards.