All the life processes together are its?

I believe that a good way to summarize all the processes is metabolism.
Metabolism is the sum of all the (chemical) processes starting at the beginning of an organisms' life and ending at death.

1.   Reproduction, is as vital for an entire race to survive. It prolongs their generation onwards and offspring to the next centuries to pass by. 
2.   Obtaining energy. In both humans and animals, even plants is a challenge because these creatures need to work in order to obtain these need resource from food –preys. 
3.   Maintaining structure. For the living organisms to still exist they need to keep themselves intact. Combating diseases and having nutrition. This is a by-product of having energy.   
4. Irritability. Responding to stimulus
5. Excretion. Able to dispose waste
6. Movement. Being able to be in one place to another.
7. Growth. Able to develop.
8. Death.

During interphase DNA is copied. So if there was no interphase, the new cells wouldn't have enough DNA.