Protozoa are usually unicellular, that is, they consist of one cell. We call independent only that cell that is capable of performing all the functions of living organisms, isolating itself from others. The cells of protozoa are able to independently extract nutrients, convert them into energy. In general, they can be called independent organisms.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.