evolution

On the mili volt scale, body genarates electricty in its cell by using chemical reactions. Nerve cells cominicate with each other in this way. Organism has done it for million years. Science, however, began to learn from a fish how the electricty storing just almost one hundered fifty years ago.

Question one;

Why does not Body , in particual brain, has got the knowledge of electricty that genarete and use by it professionaly?

Question two;

How does organism improve itself by using light without being aware of it? In addition, how did organism reach the optical science ( refraction of light ).