Nuestro sistema inmunitario emplea el tiempo de sueño para regenerarse, lo que le permite luchar con eficacia contra contra las toxinas y los gérmenes que de forma continua nos amenazan.
We don’t have any view of the article, so we have no context as to what the purpose is.
With adding a “s” at the end, for example with the word “sierra” if I wanted to make it plural I would just add a “s” at the end and it makes it “sierras” which is plural and also another is like with “carro” if I want to turn it into plural I’ll just simply add the “s” at the end and now it’s “carros”.
