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Lightweight plastic hats, commonly called _____, afford little protection and do not conform to regulations.
Sexual Maturity
The stage in an organism's life cycle when it becomes capable of reproductive activity.
Secular Trend
Trend that can be seen only by observing several generations, such as the trend toward earlier attainment of adult height and sexual maturity, which began a century ago in some countries.
Primary Sex Characteristics
Organs directly related to reproduction, which enlarge and mature during adolescence.
Gonads
The primary reproductive organs that produce gametes (sperm in males, ova in females) and various sex hormones; the testes in males and ovaries in females.
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