Which of these is an example of a composite material?

A. Wood planks used as beams to support roofs

B. Aluminum for the outer layer of an airplane

C. Fiberglass (a polymer that's is reinforced with embedded glass fibers)

D. Steel cables designed to be lightweight and strong

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.