What does the equilibrium model of island biogeography maintain?
a. The equilibrium model of island biogeography maintains that the number of species on an island is determined by a balance between immigration and extinction rates.
b. The equilibrium model of island biogeography maintains that larger islands have higher immigration rates and lower extinction rates.
c. The equilibrium model of island biogeography maintains that smaller islands have higher extinction rates and lower immigration rates.
d. The equilibrium model of island biogeography maintains that the distance from the mainland also influences immigration and extinction rates on an island.