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

What is the primary threat in marine environments?

Which of the following strategies would most rapidly increase the genetic diversity of a population in an extinction vortex?a. Establish a reserve that protects the population's habitat.b. Introduce new individuals transported from other populations of the same species.c. Sterilize the least fit individuals in the population.d. Control populations of the endangered population's predators and competitors.

Ospreys and other top predators are most severely affected by pesticides such as PCBs because theya. are especially sensitive to chemicals.b. have very long life spans.c. store the pesticides in their tissues.d. consume prey in which pesticides are concentrated.

Why is the common phrase 'humans and animals' not accurate in biology? Suggest one way that a more scientific outlook could boost conservation efforts.

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.

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.