A) The longer the chain length of a saturated fatty acid, the higher the melting temperature. B) The difference in melting temperature between a saturated fatty acid and an unsaturated fatty acid with the same chain length is only a few degrees C. C) Most types of fat in many animals is used in energy production. D) Some unsaturated fatty acids are liquid at physiological temperatures. E) Fatty acids exist in the anionic form (RCOO-) at physiological pH.