Help, both and why?

Which of the following is not a biological function of lipids? A) They store energy. B) They catalyze chemical reactions. C) They insulate animals from cold temperature. D) They form membrane of cells. E) They act as signaling molecules. Which of the following statements is false? A) Solid lipids are called fats. B) Liquid lipids are called oils. C) Fats float on water. D) Oils float on water. E) Fats and oils generally are more soluble than fatty acids.