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  1. Discuss the interrelationship between sea otters, sea kelp, and sea urchins. Be sure to include in your answer the concept of what a keystone species is and which species of the three is the Keystone species. What keystone species was reintroduced into Yellowstone Park and what was the impact? (12 points)
  1. Discuss the difference between a native species, an introduced species, and an invasive species? What impact do introduced and invasive species have on food webs? (8 points)
  1. What are evolution and natural selection? Describe how species adapt to the environment? How do humans use artificial selection? (15 points)
  1. How does biodiversity enhance stability in an ecological community? How are humans impacting biodiversity? Why is suburban landscape dominated by lawn so bad for biodiversity?
 
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