Which of the following statements is true? choose one: a. bronze was used as early as 4000 b. c.e. to replace less-desirable iron tools. b. bronze is harder than copper, so it retains a cutting edge sharper than that of copper. c. bronze is an alloy of copper and chromium. d. copper is not easily smelted, because extremely high temperature is required.

23. how does specialization among nations encourage interdependence? nations work together to share labor and resources to produce vital goods. nations sign treaties prohibiting taxes on imports. nations produce specific goods and then trade to obtain things they need. nations that are more developed agree to fund development in nations with limited industry.