What are the combined states of carbon?

Combined states of carbon:

• Carbon can exist in various forms owing to the property of its atoms to combine in different ways.
• Carbon is said to exist in a combined state when it is bonded with some other element other than carbon such as oxygen, and calcium in the form of carbonates.
• Combined states of carbon are in the form of organic and inorganic compounds.
• Organic compounds include; Food nutrients (like proteins, fats and vitamins), Carbohydrates(like glucose, starch and sugar), Hydrocarbons(like methane, ethane), Acids and alcohols, etc.
• Inorganic compounds include; Carbon dioxide, Carbon monoxide and salts like ${\mathbf{CaCO}}_{\mathbf{3}}$(limestone), ${\mathbf{Na}}_{\mathbf{2}}{\mathbf{CO}}_{\mathbf{3}}$(washing soda) etc.