sentence: Copper is found in small amounts in living things.
sentences_before: Copper can be found as a metal in the ground. Normally, it is green on the outside. Most copper is not as a metal but in chemical compounds. Chalcopyrite is the most common copper ore. It is a mixture of pyrite and copper sulfide.
sentences_after: Some mollusks and arthropods have blue blood because they have copper in their blood. Animals such as humans and other mammals have red blood because it contains iron.
concept_name: copper
headings: Copper Occurrence
categories: Chemical elements Metals