Answer:
A
Explanation:
Water pollution is a concern because of the lack of waste treatment options. Sewage and industrial waste have been dumped into water sources. Also of concern is the limited supply of freshwater. With Dubai's large population, desalination processes have become necessary to provide people with drinking water.
Answer:Lopez, legal case in which the U.S. Supreme Court on April 26, 1995, ruled (5–4) that the federal Gun-Free School Zones Act of 1990 was unconstitutional because the U.S. Congress, in enacting the legislation, had exceeded its authority under the commerce clause of the Constitution.
Answer:
Maya astronomer-priests looked to the heavens for guidance. They used observatories, shadow-casting devices, and observations of the horizon to trace the complex motions of the sun, the stars and planets in order to observe, calculate and record this information in their chronicles, or "codices".
Explanation: