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The concepts of convergent and divergent evolution through the examination of various organisms. Students will define the terms, identify similarities and differences between species, and discuss the factors influencing their appearance and behavior. images of a hummingbird, hummingbird moth, salmon, and dolphin, as well as a discussion on convergent evolution and divergent evolution with examples.
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Convergent & Divergent Evolution
Converge: __________________________________________________________
Diverge: ___________________________________________________________
A. Describe, in a list, all of the SIMILARITIES that you see between the bird and moth.
B. Are birds and insects (like this moth) closely related groups of organisms? Explain.
A. Describe all of the SIMILARITIES that you see between the salmon and dolphin.
B. Are dolphins and fish closely related groups of organisms? Explain.
If you look at the graphic of mammals you can see that mammals vary greatly in size, shape, color, and behavior. Yet, despite looking very different, all mammals are a relatively closely related category of animals. The fossil record suggests that the first mammal appeared only recently (220 million years ago).
What causes closely related species to look so different (hint: what factors influence the appearance of organisms)?
Provide at least two more examples of divergent evolution (research examples only after you've tried to come up with some with your lab group first.