Chlorophyll is necessary for photosynthesis to take place because it-

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

This is the nitrogenous base only found in rna

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.