Answer the following question given this paragraph: 

A mineral is an inorganic substance. It was not made by living organisms. Organic substances contain carbon. Some types of organic substances are proteins, carbohydrates, and oils. Everything else is inorganic. In a few cases, living organisms make inorganic materials. The calcium carbonate shells made by marine animals are inorganic.


Q: Organic substances, including proteins, carbohydrates, and oils, contain what element?


A:
carbon