Why does sunflower oil exist and wheat oil does not exist?

Various nutrients are required for seed germination. However, in different plants, these substances may be different. In some plants, this is starch, then their seeds will be dry, and in others – oily fats that feed the seedling the first days of life after germination. So, for example, wheat seeds are dry, and sunflower seeds contain a lot of vegetable fats, which makes it possible for a person to obtain vegetable oil from them, which is very useful and used for food purposes.