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
Pubic hair be regarded as unaesthetic or embarrassing and is therefore trimmed or otherwise styled to avoid it being visible. Pubic hair forms in response to the increasing levels of testosterone in both girls and boys. Those hair follicles are located and stimulated in androgen sensitive areas develop pubic hair. The Tanner scale describes and quantifies the development of pubic hair. Before the onset of puberty, the genital area of both boys and girls has very fine vellus hair (stage 1). At the onset of puberty, the body produces rising levels of the sex hormones, and in response, the skin of the