Carbon-based substances are materials that primarily consist of carbon atoms. These substances can be found in various forms, including solids like graphite and diamond, as well as liquids like oil and gases like carbon dioxide. Carbon's ability to form strong bonds with other elements makes it a fundamental building block of life and a key component in many chemical compounds. Many organic compounds, which are essential for living organisms, are carbon-based. For example, proteins, carbohydrates, and lipids all contain carbon and play crucial roles in biological processes. Additionally, carbon-based materials are widely used in industries, from plastics to fuels, highlighting their importance in everyday life.