Please help me, I don’t know what to do..

Under the soviet system, the government a. controlled all forms of communication. b. allowed newspapers to print whatever they wanted. c. controlled editorials but not the reporting of news. d. encouraged access to a wide variety of news sources. select the best answer from the choices provided a b c d

Which of these is not a nucleotide base found in dna?

Ascientific idea becomes valid when it is what?