hello everyone .when someone takes a bath, he/ she becomes clean. But why does the towel he/ she uses becomes dirty?

Probably because the towel gets wet and the moisture will cause mold to grow? Not sure though

Explanation:

The towel scrapes off any remaining dead tissue on your skin.  Another factor is water; now that the towel is damp, it is much more susceptible to have something stuck to it.  e.g. dust

answer; all of the above;

i think she would gain 18 grams