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How does evolution result in similarities and differences?

Earthword, mealworm,and cricketIn this hands-on, minds-on activity, students learn about the two ways that evolution produces similarities: (1) inheritance from a shared evolutionary ancestor (homologous characteristics) and (2) independent evolution of similar characteristics to accomplish the same function (analogous characteristics).

Students use these concepts to analyze the similarities and differences between bat and squirrel skeletons and between bat and insect wings. In the laboratory investigation, students observe the external anatomy and locomotion of earthworms, mealworms, and crickets. Students use these observations and the concepts they have learned to figure out which two of these animals are more closely related evolutionarily. (NGSS)

Download Student Handout: PDF format or Word format

Download Teacher Preparation Notes: PDF format or Word format


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