If you can only pick 1, pick the 2nd choice. If more than 1 may be chosen, number 3 is also valid.
Answer: The study of ecosystem is important for Environmental Conservation, Resource Allocation, reduce pollution and destruction of ozone layer. It provides information about the benefits of environment and judicious use of Earth's resources in ways that make the environment healthy for future generations.
Explanation:
Assuming you're referring to the United States, the Constitution grants these powers only to the federal government--specifically Congress--meaning that the states have no war powers.
The west because some of the east wanted to be like the north
