Environmental Science 15th Edition by Scott Spoolman,Tyler Miller

Exercise 3

Define and distinguish among native , nonnative , indicator , and keystone species and give an example of each. What major ecological roles do many amphibian species play ( Core Case Study )? List six factors that contribute to the threats of extinction for frogs and other amphibians. Describe the role of the American alligator as a keystone species. Explain why we should protect sharks.