Discussion
The period of human embryo is
Answer: C
Prenatal development has three periods: the germinal period (fertilisation to about two weeks), the embryonic period (from the 2nd to the 8th week) and the fetal period (from the 9th week to birth). During the embryonic period the main organ systems form. The options 2-4 weeks and 2-6 weeks stop short of the end of the period, and 1-8 weeks wrongly includes the first week, which belongs to the germinal period. The answer is 2-8 weeks.
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