Headphones should be constructed so that when you play music the volume has to stay at a safe level meaning you can't control it so people don't blow their ear drums. Some people may like their music loud and others not so much so it wouldn't be fair if they couldn't control how high or low it goes.
Answer:
Death, the sun, a wall, and in some cases, freedom.
Explanation:
These are objects and theories. Death can be personified, the sun can also be. A grizzly bear and young boy are already alive, so they can't be personified. I hope this helped.
Awinita Is not American and probably from a third world country or something i.d.k.