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Question
Describe the three main periods of prenatal development, and the major steps for developing into a person for each stage.
Typical prenatal development can be divided into three periods: germinal, embryonic, and fetal. The first period is called the germinal period. During this time, the zygote is created, cell division takes place, and the zygote attaches to the uterine wall. The second period is called the embryonic period. During this time, the rate of cell differentiation intensifies, support systems for the cells form, and organs appear. The embryo is composed of the endoderm, ectoderm, and mesoderm. Life-support systems form. These include the placenta, the umbilical cord, and the amnion. Organogenesis (the process of organ formation) takes place. The third period is called the fetal period. During this time, dramatic growth and development occur. The mother can feel leg movements. The sex of the baby can be determined.
Answer
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