Villi a. are found throughout the gastrointestinal tract. b. generate movement of materials in the large intestine. c. increase surface area in the small intestine. d. contain both smooth and skeletal muscle fibers. e. All of the choices are correct.

1. -define adaptation2 explain darwin's theories of descent with modification and natural selection in detail3. -explain how each of these provides evidence for evolution: a. -fossil record, including superposition and transitional fossilsb-anatomy, including homologous structuresc-biological molecules, including dna and proteins4. -explain the difference between convergent and divergent evolution.5. -define and give three examples of artificial selection6. -define and give one example of coevolution.7. -explain biodiversity and how it benefits humans.8. -explain a type of population lest affected by environmental change.