SORU: boşluğa uygun düşen cümleyi bulunuz
Copper has been known since prehistoric times. It is an excellent conductor of heat and electricity, and is used extensively in roofing, utensils and electrical wiring. ........ . For example, it is required for the formation of chlorophyll in plants, and traces of it are necessary in the human diet to aid in the breakdown of sugar. However, too much copper in the diet can cause cirrhosis of the liver, failure to grow and jaundice.