The governing system in new spain allowed conquistadors to collect tributes from native americans in exchange for protection and conversion to christianity. this system was called the system. a. encomienda b. viceroyalty c. peninsular d. mestizo

Your answer is going to be B

The correct answer is A. Encomienda. 

Its decreasing because of illnesses

The answer to this question is  c. pharmaceutical accumulation  reclaimed water refers to the water that being used again after it already  used for agricultural purposes.this type of water often contains pharmaceutical accumulation because of the chemical fertilizer that is used for the plants is absorbed into the water.