Ascomycota of their hosts. Owing to their long evolutionary history, the Ascomycota have evolved the capacity to break down almost every organic substance. Unlike most organisms, they are able to use their own enzymes to digest plant biopolymers such as cellulose or lignin. Collagen, an abundant structural protein in animals, and keratin—a protein that forms hair and nails—, can also serve as food sources. Unusual examples include "Aureobasidium pullulans", which feeds on wall paint, and the kerosene fungus "Amorphotheca resinae", which feeds on aircraft fuel (causing occasional problems for the airline industry), and may sometimes block fuel pipes. Other species can
Artificial nails overlay acts as a false layer of nail, protecting the nail plate from splitting or becoming damaged. Typically, these methods require the assistance of a trained professional. Cheaper, less rigid tips that can be quickly glued at home are an option to those unwilling to enlist one. Another inexpensive option are stick-on nails, the durability of which ranges from one day to two weeks. Historically, artificial nails were common symbols of status all across the world: "The earliest experiments and resultant artificial nails used a monomer and polymer mix applied to the nail and extended over a supporting form. This