What position of the cellular theory belongs to R. Virkhov?

A cell is an elementary unit of the living;
every cell comes from another cell;
all cells are similar in their chemical composition;
a similar cellular structure of organisms is evidence of the common origin of all living things.

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.