Unsaturated fatty acids, which contain one or more double bonds, are healthier alternatives to saturated fatty acids, which have no double bonds. The presence of double bonds affects their physical properties, making unsaturated fats usually liquid at room temperature. Therefore, the correct answer is B. unsaturated.
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Unsaturated fatty acids contain double bonds, whereas saturated fatty acids do not. These structural differences affect their physical properties and health implications. Understanding these types is essential for nutrition and dietary choices. ;