The ability to recycle aluminum (or glass, or plastic) is ultimately an illustration of

The right answer is The Law of Conservation of Mass

This law, discovered by Lavoisier, states that mass is neither created nor destroyed in chemical reactions or physical transformations, that means that the mass of the products is the same as the mass of the reactants. Basically, it explains that the mass of any initial element of the reaction will equal the mass of the element when the reaction comes to an end.  

answer; case studies;

none of the wise ones regretted his going means that everyone believed in beowulf and the author means that he or she knew he had to stop grendel.

a wise man who is kind and noble will always be winning compared to an evil one. because at the end of the day grendel – the evil one will be defeated.