Which of the following occurs during the embryonic stage?

A. The zygote implants itself in the uterine wall. B. The fetus reaches full term and is ready to be born. C. The vital organs and bodily systems begin to form. D. The fetus' footprints and fingerprints begin to form.

The three major stages of prenatal development are germinal, embryonic, and fetal. The embryonic stage occurs during the third to eighth weeks of pregnancy.

The zygote implants itself in the uterine wall also the formation of the placenta occurs during this stage. Correct answer: A

In this stage also the neural tube, which forms the brain and spinal cord, begin to develop.

The answer is C. The vital organs and bodily systems begin to form.