In girls, which of the following is typically the first visible sign of puberty?

1. Puberty in girls follows a broadly predictable sequence of physical changes. 2. The first visible change is breast tissue development. 3. This is followed by growth of axillary and pubic hair, then the growth spurt. 4. Menarche, the start of menstruation, is described as the next step after these earlier changes, so it is not the first sign. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 27 "The Reproductive System", p.1311-1312 §Signs of Puberty_