The different between two molecules included the type of sugar that forms a section of the molecules and the identify of one of the four nigtrogenous bases that make up another section of the molecules. These two molecules are

DNA and RNA

Explanation:

The difference between two molecules include the type of sugar that forms a section of the molecules and the identity of one of the four nigtrogenous bases that make up another section of the molecules. These two molecules are Ribonucleic acid and Deoxyribonucleic acid.

Ribonucleic acid contains Ribose sugar while Deoxyribonucleic acid contains Deoxyribose sugar which is the major difference between the two molecules.

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