Children from china’s many different ethnic groups are taught to read and write in

the main dialect of their region

the dialect they speak at home

mandarin, the northern dialect

both english and chinese

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.

Answermost of the time it would be ground into fine sediment,and sometimes they are carried away from the original location;

Cpopulation density