The concept map below shows the flow of energy and materials in photosynthesis and cellular respiration.

Which molecules are represented in the figure by the number 2?

a
H2O and O2

b
H2O and CO2

c
sugars and CO2

d
sugars and O2

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.