It is believed that viruses and bacteriophages are the isolated genetic elements of cells that evolved along with cellular forms of life. Some of them could be formed from plasmids, small DNA molecules that could be transmitted from one cell to another, while others could come from bacteria. In evolution, viruses are an important means of horizontal gene transfer, causing genetic diversity.
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.