The bases of rna are the same as those of dna except that rna has uracil instead of adenine cytosine instead of quanine uracil instead of thymine cysteine instead of cytosine

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.