Bad gases in the air, like the smoke from cars. the trees filter that.
Answer: A.
The amount of violence has been decreasing, so few people have been killed.
Explanation:
The "War on Drugs" does indeed see the U.S. government spending more than $500 million a year as they raid supply chains and arrest traffickers to stem the flow of drugs into the U.S.
Most of the violence does occur near the U.S.-Mexico border as gangs fight to control smuggling routes and U.S. agents attempt to stop them along with police officer, most of whom are dedicated to ending drug smuggling.
The violence however has not been decreasing. Indeed, cartels have become more violent and with the rise of new cartels like the New Jalisco cartel, the violence has spread.
The problem of elephant destroying trees in Southern Africa is due to competition
