Questions & Answers about La cáscara del huevo fue al cubo de la basura.
Because del is the mandatory contraction of de + el.
- de el huevo → del huevo
- In standard Spanish, you normally must contract de + el to del.
So la cáscara del huevo literally breaks down as:
- la cáscara = the shell
- del huevo = of the egg
A similar contraction happens with a + el = al later in the sentence.