The two weeks following fertilization are considered to be a critical period developmentally for the zygote.

Name: The two weeks following fertilization are considered to be a critical period developmentally for the zygote.
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This is true because during these two weeks, the zygote undergoes rapid cell division and differentiation that will ultimately determine the development of all the major organ systems. Any disruption or damage during this time can result in major birth defects or pregnancy loss.

The Two Weeks Following Fertilization Are Considered to Be a Critical