Biologists claim that the all-taxa survey now under way at the Great Smoky Mountains National Park in the United States will improve their ability to estimate the total number of species living today. Discuss the benefits and limitations that this data set will provide in understanding the extent of global biodiversity.

Which cause of extinction results from humans' direct use of a species?a. overexploitation;b. habitat fragmentation;c. pollution;d. introduction of competitors or predators;e. global warming

Which of the following statements about protected areas established to preserve biodiversity is true? (A) About 25% of Earth's land area is now protected. (B) National parks are the only type of protected area. (C) Management of a protected area does not need to be coordinated with management of the surrounding area. (D) It is especially important to protect biodiversity hot spots

Of the following statements about protected areas that have been established to preserve biodiversity, which one is not correct?a. About 25% of Earth's land area is now protected.b. National parks are one of many types of protected areas.c. Management of a protected area should be coordinated with management of the land surrounding the area.d. It is especially important to protect biodiversity hot spots.

Movement corridors area. the routes taken by migratory animals.b. strips or clumps of habitat that connect isolated fragments of habitat.c. landscapes that include several different ecosystems.d. edges, or boundaries, between ecosystems.

With limited resources, conservation biologists need to prioritize their efforts. Of the following choices, which should receive the greatest attention for the goal of conserving biodiversity?a. a commercially important speciesb. all endangered vertebrate speciesc. a declining keystone species in a communityd. all endangered species

Some biologists prefer to focus efforts on preserving endangered species while others prefer to focus on preserving ecosystems. What is your advice to biologists, based on the evidence from this chapter?

Which of the following human activities generates the most carbon dioxide?a. driving;b. cooking;c. bathing;d. using aerosol sprays

Which of the following statements about protected areas is not correct?a. We now protect 25% of the land areas of the planet.b. National parks are only one type of protected area.c. Most reserves are smaller in size than the ranges of some of the species they are meant to protect.d. Management of protected areas must coordinate with the management of lands outside the protected zone.