Which of the following is an example of a benefit of species diversity in an ecosystem?
a
After a forest has been cleared, certain species have to compete for resources.
b
After a forest fire, some species are able to move higher up in trees to find food and make nests.
c
After a period of drought, certain plants with shallow roots take all the available water from the soil.
d
After a prolonged winter, some species are able to migrate to warmer climates.
d
After a prolonged winter, some species are able to migrate to warmer climates.