Examlex
A graben is characterized by___________ .
Trophoblast
The outer layer of cells surrounding a blastocyst in early pregnancy, which provides nutrients to the embryo and develops into part of the placenta.
Embryonic Period
A stage of prenatal development that takes place from fertilization until about the eighth week, during which the major organs and structures of the organism begin to develop.
Implantation
The process by which a fertilized egg attaches itself to the lining of the uterus to begin pregnancy.
Placenta
An organ that develops in the uterus during pregnancy, providing oxygen and nutrients to the growing fetus while removing waste products.
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