Which are necessary to make dna replication semi-conservative? i) separation of the strands by rna polymerase ii) complementary base pairing iii) use of a pre-existing strand as a template

Which of the following statements best distinguishes a hypothesis from a theory? a. theories are hypotheses that have been proved. b. hypotheses are guesses; theories are correct answers c. hypotheses usually are relatively narrow in scope; theories have broad explanatory power. d. theories are proved to be true; hypotheses are often contradicted by experimental results.