What gets wetter & wetter the more it dries?

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere

Nucleic acids offer variability because they contain alternate forms of genes called .

Is this mrna or rna need need the answer in a hurry