What makes lipids different from other organic compounds? A. They make simple sugars. B. They are made of amino acids. C. They carry information and guard against invasion. D. They don't dissolve in water.

D is the correct answer. Lipids only dissolve (are soluble) in non polar solvents, which are liquid solvents whose electrical charges (from electrons) are not present or are cancelled out. Lipids include fats, waxes, some vitamins that are fat-soluble and other molecules.