Question

Which of the following organic compounds is the main source of energy for living things?a.carbohydratesc.nucleic acidsb.lipidsd.proteins

Answer 1

Answer:

Carbohydrates

Explanation:

Answer 2

Well, carbohydrates burn and release energy. Nucleic acids give identity (like DNA, RNA). Lipids also give energy, but it's more difficult (they must be first turned into carbohydrates first). Proteins are building blocks for the cells.
Now, knowing all of this should make it easy to choose the correct answer :)