Answer:
The more you take, the more you leave behind.
I have one, you have one. If you remove the first letter, a bit remains. If you remove the second, bit still remains. If you remove the third, it still remains.
Who spends the day at the window, goes to the table for meals. And hides at night?
In buckles or lace, they help set the pace. The farther you go, the thinner they grow.
I never was but always will be. No one ever saw me but everyone knows I exist. I give people the motivation to better themselves every day. What am I?
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.