Explain how the shape of the small intestine and the many villi on the inner surface of the wall of the small intestine increase the rate of absorption of digested food molecules from the lumen of the small intestine to the blood.

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.