Between what ages does a major growth spurt happen in boys?

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Source:

  • 10 to 15 years %
  • 16 to 18 years %
  • 8 to 12 years %
  • 15 to 19 years %

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Did you know...
Despite their incredibly long necks, Giraffes have the same number of neck vertebrae as humans: seven. They just have elongated bones. Interestingly, some species of sloths have up to 10 vertebrae in their necks: more than most mammals.
Image credit: RICKEY HUTCHINSON.