Organic molecules are compounds that contain carbon atoms bonded to other atoms such as hydrogen, oxygen, nitrogen, sulfur, and phosphorus. They play a crucial role in the structure and function of living organisms. Here are some of the different types of organic molecules and their contributions to living organisms:

1. Carbohydrates: These are molecules made up of carbon, hydrogen, and oxygen atoms, and they serve as a source of energy for cells. Examples of carbohydrates include glucose, fructose, and starch.
2. Lipids: These are molecules that are insoluble in water and are made up of fatty acids and glycerol. They serve as energy storage molecules, as well as important components of cell membranes. Examples of lipids include triglycerides, phospholipids, and steroids.
3. Proteins: These are molecules made up of amino acids that are essential for the structure and function of cells. Proteins serve as enzymes, hormones, and structural components of cells. Examples of proteins include enzymes that facilitate chemical reactions in cells, antibodies that help fight infections, and structural proteins such as collagen.