The virus (from lat. Virus – poison) is the simplest form of life, since they do not have a cellular structure. The main differences about other living organisms:
• Viruses are obligate parasites, since viruses are not able to multiply outside the cell.
• Outside the cell, viral particles behave like chemicals.
Currently known viruses that multiply in the cells of plants, animals, fungi and bacteria (the latter are usually called bacteriophages). Viruses that infect other viruses (satellite viruses) have also been detected.
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.