You realize that however much you don't think about death - or think that's for other people - you're just an organism living from day to day. I'm just grateful I'm here.
Reproduction is so primitive and fundamental a function of vital organisms that the mechanism by which it is assured is highly complex and not yet clearly understood. It is not necessarily connected with sex, nor is sex necessarily connected with reproduction.
Single cells analyze thousands of stimuli from the microenvironment they inhabit. The more awareness an organism has of its environment, the better its chances for survival. When cells band together they increase their awareness exponentially. Division of labor among the cells in the community offers an additional survival advantage. The efficiency it enables more cells to live on less. Evolution is based on an instructive, cooperative interaction among organisms and their environment enables life forms to survive and evolve in a dynamic world.
The problem that we, as living organisms, face - and not we only, humans, but any living organism faces - is the management of life.
A property of an organism enters into its life (and survival) in many different ways, some more salient than others. But there is no simple notion of its being "for" some function.
Life is extraordinarily resilient. It's been around for over a billion years.
I have always had this basic biological question in terms of evolution, if the drive to evolution is to like survive. An organism that survives well, there is really no need for consciousness in there.
I consider that all which lives must feed itself and nourish itself in a manner suitable to the way in which it lives.
It is in this mutual dependence of the functions and the aid which they reciprocally lend one another that are founded the laws which determine the relations of their organs and which possess a necessity equal to that of metaphysical or mathematical laws, since it is evident that the seemly harmony between organs which interact is a necessary condition of existence of the creature to which they belong and that if one of these functions were modified in a manner incompatible with the modifications of the others the creature could no longer continue to exist.
Every organism requires an environment of friends, partly to shield it from violent changes, and partly to supply it with its wants.
Even biology tells us that a high degree of habitual well-being is not advantageous to a living organism.
Commencement Address, Harvard University, June 8, 1978