Biologists must constantly keep in mind that what they see was not designed, but rather evolved.
Chance is the only source of true novelty.
Almost all aspects of life are engineered at the molecular level, and without understanding molecules we can only have a very sketchy understanding of life itself.
It is notoriously difficult to define the word living.
An honest man, armed with all the knowledge available to us now, could only state that in some sense, the origin of life appears at the moment to be almost a miracle, so many are the conditions which would have had to have been satisfied to get it going.
A busy life is a wasted life.