Why does interphase necessarily exist in the cell life cycle?

In interphase, preparation for division and DNA doubling takes place. If it did not happen, then with each division of the cell, the number of chromosomes would be halved, and rather soon there would be no chromosomes in the cell at all.

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.