Which two structures are involved in energy production on the cellular level?
a. chloroplasts and mitochondria
b. mitochondria and golgi bodies
c. golgi bodies and chloroplasts
d. microtubules and mitochondria

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.