Endangered And Extinct Species Question Preview (ID: 30443)


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About half of Earth's biodiversity exists in its tropical rain forests. This means that tropical rain forests have
a) more plants than animals
b) more animals than plants
c) the greatest number of animals of any climate region
d) the greatest number of different species of any climate region

Extinction is a natural process that has occurred throughout the history of life on Earth. In the 21st century, extinction is a big problem because:
a) now we can record when it happens
b) there are fewer species that could become extinct than ever before
c) the rate of extinction is much faster than ever before
d) the rate of extinction is much slower than ever before

When the number of individuals in a species becomes so small that the species may not survive, the species is
a) endangered
b) threatened
c) extinct
d) troubled

Explain the relationship between extinction and biodiversity.
a) Extinction contributes to an increase in biodiversity.
b) Extinction contributes to a decrease in biodiversity.
c) Extinction randomly changes biodiversity in one direction or the other.
d) Extinction has no impact on biodiversity.

If none of the individuals within a particular species can survive to reproduce, what will happen to that species?
a) they will increase in number
b) they will adapt to a new environment
c) they will become extinct
d) they will evolve into a new species

An ecologically healthy area has:
a) a few species with very few individuals of each species
b) a few species with a sustainable number of individuals of each species
c) many species with very few individuals of each species
d) many species with a sustainable number of individuals of each species

Extinction of species is:
a) rare
b) unheard of today
c) common
d) predetermined

The term applied to a species that can no longer be found living is
a) endangered
b) extinct
c) threatened
d) troubled

What is an endangered species?
a) a species that is at risk of becoming extinct
b) a species that has become domesticated
c) a species that is included in catch and release programs
d) a species that is very aggressive

When the number of individuals in a species becomes so small that the species may not survive, the species is:
a) troubled
b) threatened
c) extinct
d) endangered

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