to treat the callus, you decide to shave off some of the excess epidermis. while doing this, you notice that there is no pain or bleeding. why wouldnt it cause pain to remove only the superficial part of the epidermis? why wouldnt it bleed?

Well if you pick a machine to work on and that's gonna be your exercise if you don't stick to that machine your muscle strength your muscle mass rather will change because you haven't been doing it you change something in your exercise routine which changes your body's form of dealing with things for example you might become weaker or stronger depending on what kind of exercises you do in whether or not the machine you picked actually your muscles grow.

Ithink it's choice d (antibiotic resistance)