The type of reproduction a new cell or organism that is an exact genetic copy of its parents

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.