What are the characteristics of viruses?

1) viruses are non-cellular life forms;
2) the genetic material is represented by DNA or RNA and is surrounded by a protein capsule (capsid);
3) viruses are obligatory intracellular parasites (they function only in the host cells).

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.