The importance of the fact that cells can divide is something that goes largely unremarked. That they can divide is missed when learning about how they do divide.
We come to a biology class. We learn that there are such things as cells - and how we are composed of cells. We then learn about how they divide. However, the very fact that they divide is highly significant. Yet, we do not ponder the significance of this. We rarely ever stop to consider what this means for our lives.
I will not attempt a list of how cell division is significant. Any list I offer will be incomplete. However, we should always have this in mind.