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  • 17-01-2019
  • Biology
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stage that begins with fertilization

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rainbow1748 rainbow1748
  • 18-01-2019
Development of the embryo begins at stage 1 when sperm fertilizes an oocyte and together they form a zygote. Human development begins after the union of male and female gametes or germ cells during a process known as fertilization (Conception).
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