What type of fatty acid contains two or more double bonds along the carbon chain?

The correct answer is polyunsaturated fats because these types of fatty acids are characterized by having two or more double bonds in their carbon chains. This structural feature distinguishes them from other types of fatty acids. Monounsaturated fats contain only one double bond, while saturated fats have no double bonds at all, meaning they are fully saturated with hydrogen atoms. Trans fats, on the other hand, can be either saturated or unsaturated but have been chemically altered to produce a trans configuration, which does not specifically relate to the number of double bonds in the fatty acid chain. Polyunsaturated fats are significant in nutrition as they include essential fatty acids, such as omega-3 and omega-6, which play vital roles in cellular functions and overall health.