How is complementary base paring different when pairing DNA to DNA than when pairing DNA to mRNA

dna is made up of six smaller molecules -- a five carbon sugar called deoxyribose, a phosphate molecule and four different nitrogenous bases (adenine, thymine, cytosine and guanine).

answer: 4

explanation: 8

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.