Well, it's probably microscopic, and it's never easy to study microscopic things, although the amazing tools that we now have to do that allow us to study things in much greater depth, at much smaller scales than ever before.
Bueno, es probablemente microscópica, y nunca es fácil estudiar cosas microscópicas, aunque las maravillosas herramientas que ahora tenemos nos permiten estudiar cosas con mucho mayor detalle, en escalas mucho menores que antes.