A．The decision limited the number of businesses that could operate in more than one state.
B．The decision gave the national government control over commerce between states.
C．The decision represented the first time the Supreme Court supported dual federalism.
D．The decision led to regulations that delayed the onset of the Great Depression.
A．To show that some species cannot be transplanted easily to new environments.
B．To give an example of rapid population growth that is not followed by decline.
C．To emphasize that species with rapidly growing populations harm ecosystem.
D．To introduce a study on the changing population size of certain species.
A．The availability of food is more important for species than the availability of space.
B．The amount of environmental resistance in an ecosystem does not change over time.
C．Environmental resistance controls the population size of species in an ecosystem.
D．The population size of most species increases at a constant rate.