The key concept for section 9.1. Definition and difference between biological extinction and mass extinction. Define the background extinction rate. The percentage of the world’s identified species is likely to become extinct primarily due to human activities during this century. The number of ecosystem services that are in decline among the Earth’s 24 major ecosystem services. Give three reasons why many extinction experts believe that projected extinction rates are probably on the low side. Explain the way in which scientists estimate extinction rates and describe the challenges they face in doing so. Differentiate between endangered species and threatened species and give an example of each. List four characteristics that make some species especially vulnerable to extinction.

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Chapter 9, Problem 2CR

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The key concept for section 9.1. Definition and difference between biological extinction and mass extinction. Define the background extinction rate. The percentage of the world’s identified species is likely to become extinct primarily due to human activities during this century. The number of ecosystem services that are in decline among the Earth’s 24 major ecosystem services. Give three reasons why many extinction experts believe that projected extinction rates are probably on the low side. Explain the way in which scientists estimate extinction rates and describe the challenges they face in doing so. Differentiate between endangered species and threatened species and give an example of each. List four characteristics that make some species especially vulnerable to extinction.

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