Puberty is the period during adolescence when reproductive tissues begin to mature and the body undergoes sexual maturation, as the rate of general body growth slows down.
Two changes common to both boys and girls:
The definition must link puberty to slowing of body growth and maturation of reproductive tissues — not just say "changes occur in teenage years." For the two common changes, stick to those explicitly listed as common to both sexes in the passage (hair growth, oily skin/pimples). Avoid listing breast growth or voice cracking — those are sex-specific. Each point earns ½–1 mark; the definition earns 1 mark.