"If its habitat is not sufficiently favorable, or nurturing, the cell will choose immortality, in other words, self-sufficiency and self management. On the other hand, if the habitat is favorable, they will choose to reproduce — that way, when they die, they hand essential information and knowledge to the next cell, which hands it down to the next cell, and so on. Thus knowledge and learning are handed down, through time." 

The point of survival quoted from Morgan Freeman in the movie Lucy.