Why are the four major groups of dietary fat can be classified in this particula

Why are the four major groups of dietary fat can be classified in this particular order (30-50 words)?
Polyunsaturated fats containing omega-3 fatty acids
Monounsaturated fats and polyunsaturated fats that do not contain omega-3s
Saturated fats
Trans-fats
2. Using your knowledge of lipid structure and properties and any other scientifically reliable online or printed resources, create a ~150-word explanation of how different types of dietary fat affect our cardiovascular health. (Hint: Use such key terms as “cholesterol,” “HDL,” “LDL,” and “arteries.”) Make sure to use your own words and cite outside sources that you have used.
3. In ~100 words indicate the major sources of fat in your diet and characterize them in terms of healthy and unhealthy.
If your fat diet is not “heart-healthy,” provide specific recommendations on how to increase your consumption of healthy fats and decrease your consumption of unhealthy fats. Recommend specific foods. Take into account your taste preferences.
If your fat diet is mostly “heart-healthy,” provide specific recommendations on how to increase the consumption of healthy fats and decrease the consumption of unhealthy fats for a friend or a relative. Take into account that person’s taste preferences.