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Answer :
Final answer:
The pre-embryonic stage encompasses the first two weeks post-fertilization, defined by milestones such as fertilization, implantation, and the formation of the blastocyst. So the correct option is: A) Weeks 1-2; fertilization, implantation, formation of the blastocyst
Explanation:
The pre-embryonic stage refers to the first two weeks of prenatal development following fertilization. The correct milestones associated with this stage are A) Weeks 1-2; fertilization, implantation, formation of the blastocyst. During these initial two weeks, the zygote undergoes several mitotic cell divisions, becoming a multicellular entity known as the blastocyst, which then implants itself in the lining of the uterus. This stage lays the foundation for the subsequent stages of embryonic and fetal development.
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