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Human development

The study of the chronological processes or changes that occur from fertilization to the formation of the single-celled eukaryote (zygote) through to the formation of a human in utero and development of the human from birth through puberty to adult.
Human development covers the various stages of human life:

  • prenatal – from fertilization to birth
  • child – from birth to puberty
  • adolescence or puberty
  • adult – from age 21 onwards

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