Final answer:
The four main classes of organic compounds are carbohydrates, lipids, proteins, and nucleic acids. Carbohydrates provide energy, lipids are important for insulation and storage, proteins have many functions, and nucleic acids store and transmit genetic information.
Step-by-step explanation:
The four major classes of organic compounds are carbohydrates, lipids, proteins, and nucleic acids. Carbohydrates include sugars and starches and are a major energy source for the body. Lipids, such as fats and oils, are important for insulation and energy storage.
Proteins are involved in many functions, including structure, enzymes, and transport. Nucleic acids play a vital role in storing and transmitting genetic information, such as DNA and RNA.