Hair is a fiber that is found only in mammals.
Hair grows from a hair bulb under the skin.
A fiber found only in mammals grows from a bulb under the skin.
A fiber found only in mammals grows from a bulb under what?
a: fur and fat
b: the mammal
c: light energy
d: the skin
e: the pelt
f: the animal
g: a cuticle
h: Exfoliation