Environmental Science 14th Edition by Tyler Miller ,Scott Spoolman

تمرين 7

What is the key concept for this section What is biological extinction What is a mass extinction How can the extinction of a species affect other species and ecosystem services Describe how scientists estimate extinction rates. Give three reasons why many extinction experts believe that projected extinction rates are probably on the low side. What percentage of the world's species are likely to go extinct, largely as a result of human activities, during this century Distinguish between endangered species and threatened species and give an example of each. List four characteristics that make some species especially vulnerable to extinction.