According to MacArthur and Wilson's theory of island biogeography, the following is correct:
a. The number of species decreases with island isolation.
A factor in determining the carrying capacity of a city's environment is the water resources available to meet city needs. This is assuming this is one of the following city needs in this question. This is the only answer that pertains to the environment.
Good Luck!
Obviously true. It revolves all around them.
