How do organisms get the energy they need? by burning food molecules and releasing their energy as heat by breathing oxygen into the lungs and combining it with carbon dioxide by breaking down food molecules gradually and capturing their chemical energy by using the sun's energy to break down food molecules and form chemicals?

Asolution of an enzyme and a substrate was placed in a water bath and the temperature of the reaction was raised gradually. the graph shown was plotted at the end of the experiment. what can be concluded from the graph? a) temperature has no effect on the activity of the enzyme. b) the effect of temperature on the enzyme is unpredictable. c) the enzyme shows increased activity up to a certain temperature. d) the activity of the enzyme is inversely proportional to the temperature.