You can’t make an oyster out of nothing, nor you can’t do it in a day.
You’ve got to start with a vast variety of invertebrates, the
belemnites, trilobites, jubusites, amalekites, and that sort of fry, and
put them in to soak in a primary sea and observe and wait what will
happen. Some of them will turn out a disappointment; the belemnites and
the amalekites and such will be failures, and they will die out and
become extinct in the course of the nineteen million years covered by
the experiment; but all is not lost, for the jubusites will develop
gradually into encrinites and stalactites and blatherskites, and one
thing and another, as the mighty ages creep on and the periods pile
their lofty crags in the primordial seas, and at last the first grand
stages in the preparation of the world for man stands completed, the
oyster is done. Now an oyster has hardly any more reasoning power than a
man has, so it is probable that this one jumped to the conclusion that
the nineteen million years was a preparation for _him_. That would be
just like an oyster, and, anyway, this one could not know at that early
date that he was only an incident in the scheme, and that there was some
more to the scheme yet. (Mark Twain—A Biography).