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When Charlie the cat was a kitten, he just happened to be near the kitchen when his owner used an electric can opener to open a can of tuna for him to eat. Curious about this strange sound, Charlie went to the kitchen and found the tuna in his dish. Now, no matter how deep his coma-like sleep is when someone uses the electric can opener for any reason, Charlie scrambles to his feet and sprints to the kitchen. This story about Charlie is an example of
Epiblast
A layer of cells derived during the early development of an embryo, giving rise to all three primary germ layers.
Fertilization
Process that begins with the penetration of the secondary oocyte by the spermatozoon and is completed with the fusion of the male and female pronuclei.
Implantation
The process by which a fertilized egg attaches to the lining of the uterus, beginning the stages of pregnancy.
Chorionic Villi
Finger-like projections from the chorion that extend into the uterine wall, facilitating nutrient exchange between mother and fetus.
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