Examlex
The Cro-Magnon fossils were found in __________ and date to approximately __________ years ago.
Human Embryo
The early stage of development in humans from the moment of conception until the end of the eighth week, when it is then referred to as a fetus.
Inner Cell Mass
A group of cells inside the primordial embryo that will develop into the fetus and some of the extraembryonic membranes.
Implantation
The process by which a fertilized egg attaches to the lining of the uterus in early pregnancy.
First Week
The initial seven-day period of time, often used in reference to specific processes, events, or stages in development.
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