Anursing instructor is explaining the stages of fetal development to a group of nursing students. the instructor determines the session is successful after the students correctly choose which time period as representing the pre-embyonic stage?
a. from fertilization and to the end of the second week .
b. approximately 2 weeks after fertilization and to the end of the eighth week.
c. approximately 9 weeks after fertilization and to birth.
d. approximately 6 weeks after fertilization and to the end of 8 weeks.

The correct answer is A. From fertilization and to the end of the second week

Explanation:

Fetal or embryonic development includes different stages from fertilization to birth. The first stage is the pre-embryonic stage, this occurs after fertilization and lasts the two first weeks of pregnancy, it is called pre-embryonic stage because during this there is no an embryo but the zygote implants and later different processes of cell division occur. Additionally, the pre-embryonic stage is followed by the embryonic stage (week 3 to 8) and finally the fetus stage (week 9 to birth). According to this, if students have correctly learned about fetal development they should choose "from fertilization and to the end of the second week" as the period for the pre-embryonic stage.

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