Which of the following is an example when an uncontrolled experiment is best? a. when working with the han bodyb. when testing plant growthc. when testing the effect of water on a lawn d. when testing the effect of sugar on a starch

The equation below shows a chemical reaction. a + b + heat —> c + d according to the law of conservation of energy, which statement is true? a. the reactants absorb heat because they have less energy than the products. b. the products release heat because they have more energy than the reactants. c. the reactants generate heat because they have more energy than the products. d. the products require heat to form because they have less energy than the reactants.