What is DNA explain the concept of DNA and RNA

DNA is the abbreviation of deoxyribonucleic acid, while RNA stands for ribonucleic acid. Both the RNA and DNA carry certain genetic information, however, there is some difference between the two. DNA comprises sugar deoxyribose and RNA comprises sugar ribose. DNA is found to be stable under alkaline conditions, while RNA is not stable.  

DNA is a molecule having double strands, while RNA is a single-stranded molecule. There is a slight difference in the base-pairing found in the two nucleic acids. In DNA, the bases present are adenine, thymine, cytosine, and guanine. While RNA utilizes adenine, uracil, cytosine, and guanine bases. Both RNA and DNA perform distinct roles in humans. RNA codes for amino acids and functions as a messenger between the ribosomes and the DNA to produce proteins. While DNA is accountable for storing and conducting genetic information.  

the answer to your question is:

c. complementary base-pairing

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.