Which of the following currently poses the single greatest threat to biodiversity?
a. Invasive species
b. Overhunting
c. Habitat loss
d. Pollution
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Which of the following currently poses the single greatest threat to biodiversity?
a. Invasive species
b. Overhunting
c. Habitat loss
d. Pollution
Which of the following is characteristic of endemic species?
a. They are often found in biodiversity hot spots.
b. They are distributed widely in the biosphere.
c. They require edges between ecosystems.
d. They are often keystone species whose presence helps to structure a community.
Ospreys and other top predators are most severely affected by pesticides such as PCBs because they
a. 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.
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 species
b. All endangered vertebrate species
c. A declining keystone species in a community
d. All endangered species