A resume is required pretty much everywhere, even if they just say "We strongly encourage you to submit a resume."
Just put something together that looks halfway decent. An attractive LOOKING resume is half the battle! Most applicants aren't going to have extraordinary softs/work experience anyway.
Hit the nail on the head.
No sense worrying about what you can't change, ie what you can list on the resume. For most people who are in undergrad or have been out for less than a year, theres probably not much on there thats going to do a ton for you. Of course, working during UG, being on a sport/club, scholarships, etc that may not show up elsewhere can go here and may do a bit for you if you are on the fence.
But for those who don't have anything that really stands out, putting together a professional looking resume with no typos or errors is all you can do, and will distinguish you from those who failed to do such. I'd imagine thats why resumes are required at most schools; if you can't spend a couple hours making a resume that looks nice, it kind of says you aren't that serious.