Human Growth and Development / Unit 9 HGD 1219 short lesson, about 20 seconds
Puberty
Captions available
The idea
Puberty is the process and period of reaching physical and reproductive maturity; it begins at about eight to thirteen in girls and nine to fourteen in boys.
In practice
Pubertal changes taking around three to four years to complete.
Where people slip
The sequence is consistent though timing varies widely, so two healthy classmates can be years apart.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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