A scientist heats an unknown substance in a closed system. The graph shows the change in temperature over time and labels for five time
periods.
E
D
Temperature
B
С
Time
During which time periods is the substance shown in the graph changing
state?

Which is true concerning the products and reactants of photosynthesis and cellular respiration? a. the products of photosynthesis are sugars and the reactants of cellular respiration are starches. b. the products of photosynthesis are reactants in cellular respiration. c. oxygen is needed for photosynthesis and is given off in cellular respiration.