This lesson provides an opportunity for students to extend their understanding of the three models studied in previous lessons by using them to explain phenomena and by comparing them to one another. Students will work in groups to use the models of Paley, Lamarck, and Darwin to explain the origin of complex structures like the eye, the existence of fossils, and the variety of pigeon breeds. They will confer with another group to share ideas and participate in a class discussion comparing the models and develop written explanations for phenomena based on their understanding of the three models. This lesson represents a turning point in the unit as students conclude their examination of the ideas of Paley and Lamarck and prepare for a more in-depth study of Darwin's model of natural selection. The site also includes instructional notes for teachers and the required student handouts.
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