Final answer:
Essential fatty acids, such as omega-3 and omega-6, are required for normal body functions but are not synthesized by the body and must be sourced from the diet. These polyunsaturated fats are vital for growth and metabolism.
Step-by-step explanation:
Essential fatty acids are fatty acids required but not synthesized by the human body, therefore, they must be acquired through diet. Omega-3 and omega-6 fatty acids are known essential fatty acids. They are polyunsaturated fats and important for various body functions like normal growth and development, as well as the efficient transport and metabolism of cholesterol. The body cannot produce these fatty acids, and they must be obtained from foods like oily fish, walnuts, flax seeds, corn oil, and soybean oil which are rich sources of these nutrients.
Responding to the question about the characteristics of essential fatty acids: They cannot be synthesized by the body (A), they are required for normal body function (B - false), they include omega-3 and omega-6 fatty acids (C), and they are primarily found in polyunsaturated fats, not saturated fats (D - false).