That desire to live is quite different from a chimpanzee's or cockroaches desire to live. HOW DO I KNOW? You can guess, or say perhaps that the human brain evolved to such a point that some humans developed writing and passage of their experiences. Some humans are born developmentally disabled, so can't include them in that idea. Because some brains are not able to function that way. I have discerned and decided that is nonsense, Christine, about evolution of the human brain. It makes much more sense to me that God said, Let us make man in our image. He didn't say let us make gorillas or cockroaches in our image.