Final answer:
The provided information does not specify an animal used by both Carnegie and Edison. Thomas Edison used an elephant in the 'war of currents,' while Andrew Carnegie revolutionized the steel industry.
Step-by-step explanation:
The animal used by both Andrew Carnegie and Thomas Edison to make a point is not specified in the provided passages. However, it is well-known in history that Thomas Edison infamously used an elephant in a public demonstration to make a point about the safety of direct current (DC) electricity over alternating current (AC), as part of the 'war of currents.' Andrew Carnegie was an industrialist and steel magnate who, while not directly involved in such dramatic demonstrations, utilized principles of efficient production, such as the Bessemer Process, to revolutionize the steel industry.