Final answer:
During puberty, short, fine, non-pigmented hair is replaced with terminal hair.
Step-by-step explanation:
Short, fine, non-pigmented hair is replaced with terminal hair around the time of puberty. During puberty, both boys and girls experience the growth of hair, including armpit, pubic, chest, and facial hair. This is due to the increase in hormones, such as testosterone in boys and estrogen in girls, which stimulates the development of secondary sexual characteristics.