Final answer:
Adolescence, puberty changes, and menarche in girls are significant landmarks in the development of individuals.
Explanation:
Adolescence and Puberty Changes
- Adolescence is the stage of development where individuals become sexually mature.
- Puberty is the period during which physical changes occur, such as the maturing of sex glands and development of secondary sexual characteristics.
- Menarche is the first menstrual period experienced by girls, marking the onset of menstruation.
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