MC1
The disappearance of a particular population from a given area, but not of the entire species globally, is called
a. extinction.
b. extirpation.
c. fragmentation.
d. poaching.
b. extirpation.
By far, the biggest cause of biodiversity loss today is
a. climate change.
b. habitat change and fragmentation.
c. pollution.
d. over-harvesting.
b. habitat change and fragmentation.
Species that are at serious risk of extinction.
Endangered species
If current trends continue, the modern geologic era, known as the Quaternary period, may see the
extinction of ______.
a. one or two species per century..
b. more than half of all species.
c. all species on Earth.
d. almost 20 percent of all species.
b. more than half of all species.
Based on current data about species population trends, some scientists claim we are in the middle of
Earth’s sixth ____________________.
a. Generation
b. Mass extinction
c. Evolution
d. Extirpation
b. Mass extinction
It is when the habitat is converted into several spots physically separated.
Habitat fragmentation
Archaeological evidence shows that in case after case, a wave of ____________________ followed
whenever humans arrived on islands and continents.
a. Extirpations
b. Extinctions
c. Evolution
d. Mutations
b. Extinctions
A species that is at serious risk of extinction is called a(n)
a. extirpated species.
b. invasive species.
c. endangered species.
d. threatened species.
c. endangered species.
Species vulnerable to become endangered.
Threatened species
What global phenomenon has caused some organisms to move toward the poles or to higher altitudes?
a. warming temperatures
b. pollution
c. habitat fragmentation
d. invasive species
a. warming temperatures
The Sikhote-Alin Mountains, and the Siberian tigers living on them, are separated from other mountain
regions in which the tigers could live. The mountains are an example of a(n)
a. mass extirpation.
b. habitat fragmentation.
c. mass extinction.
d. invasive species.
b. habitat fragmentation.
The illegal hunting and killing of organisms.
Poaching
It happens when one species disappears from a region, but does not become extinct as it survives in other regions.
Extirpation