Final answer:
Puberty in girls typically begins between the ages of nine and ten. The first visible changes include the development of breast tissue and the growth of axillary and pubic hair. Girls also experience a growth spurt during puberty.
Step-by-step explanation:
Puberty in girls typically begins between the ages of nine and ten. The first visible changes that occur during puberty are the development of breast tissue and the growth of axillary and pubic hair. These changes are divided into five stages, with stage I being the child stage before puberty starts and stage V being the adult stage at the end of puberty. Girls also experience a growth spurt during puberty, which can last two years or more.