Which of the following is NOT TRUE of unsaturated fatty acids? a. Unsaturated fatty acids tend to be liquid at room temperature because the bent chains that result from double bonds occupy more space than saturated fatty acids and do not pack together well. b. By definition unsaturated fatty acids are essential fatty acids. c. Inserting double bonds into a fatty acid chain is a strategy for adapting to cold weather. d. All fatty acids yield the same amount of energy (9 kcal per gram) whether saturated or unsaturated, omega-3, omega-6, or omega-9, regardless of chain length..