Which ecosystem service do decomposers provide?
a
nutrient cycling
b
food production
c
soil creation
d
water cycling
a. Nutrient cycling
The Northern Pacific seastar is a particularly successful invasive species. Which of the following explains why it is so successful in the waters of southeastern Australia, outside of its native environment?
The Northern Pacific seastar is successful in southeastern Australia outside of its native environment because there are no natural predators, parasites or competitors to keep its population in check.
The Northern Pacific seastar is a particularly successful invasive species. Which of the following explains why it is so successful in the waters of southeastern Australia, outside of its native environment?
a
It can cling to the bottom of ships and other vessels.
b
It consumes the eggs of the spotted handfish.
c
It breeds rapidly and has no predators in this environment.
d
It is accustomed to a cold climate.
c. It breeds rapidly and has no predators in this environment.
What aspect of an organism makes it an invasive species?
a
It is from a different ecosystem.
b
It does harm and is introduced to the ecosystem.
c
It is harmful to organisms in all ecosystems.
d
It has no predators in the new ecosystem.
b. It does harm and is introduced to the ecosystem.
In an ecosystem with low biodiversity, the removal of a species will
a
not affect the ecosystem because another species will take its place.
b
disturb the ecosystem because another species will not be able to replace it.
c
not affect the ecosystem because another species will not be able to replace it.
d
disturb the ecosystem because another species will take its place.
b. Disturb the ecosystem because another species will not be able to replace it.
What is the definition of ecological resistance?
a
an ecosystem’s ability to endure in changing conditions
b
an ecosystem’s ability to manage population density
c
an ecosystem’s ability to improve after a setback
d
an ecosystem’s ability to replace species that are wiped out