Organic & inorganic

This document discusses organic and inorganic compounds. Organic compounds contain carbon and are found in living things, including sugars, starches, lipids, proteins, and fossil fuels. Inorganic compounds do not contain carbon and are often simple substances like nitrogen, oxygen, and baking soda. The document also covers nutrients needed by living things, including macronutrients like oxygen, carbon, hydrogen, nitrogen, and phosphorus, which make up 99% of the human body's mass, as well as micronutrients needed in smaller amounts, such as selenium and zinc. The four main categories of organic compounds - carbohydrates, lipids, proteins, and nucleic acids - are also defined.