We can't see it most of the time. It's invisible. They're microbes. They're tiny. But we can see them through their DNA, we can see them through the effects that they have on people.
No podemos verla la mayor parte del tiempo, es invisible. Son microbios. Son pequeños. Pero podemos verlos bien a través de su ADN. podemos verlos a través de los efectos que provocan en las personas.