Moderate

The onset of puberty:

Correct answer: D. begins approximately two years earlier on the average in girls than in boys

  • A. begins approximately eight years earlier on the average in girls than in boys
  • B. begins approximately four years earlier on the average in boys than in girls
  • C. is about the same time for boys and girls
  • D. begins approximately two years earlier on the average in girls than in boys

Explanation

Puberty typically begins around two years earlier in girls than in boys, although individual timing varies. The other options either reverse this pattern or incorrectly suggest no average sex difference.

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