So what has been the purpose of life? Dexter and Hannah have, as far as I know, never paused to reflect, either in retrospect or prospect on this question.
For them it is to live and to be, and there is no division. Multiplication, as is true for the natural world in general is in the long run cause for diversity. It seems that it is only human beings, those with the cognitive edge, if not the consciousness edge who are out of balance.