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Zygote
The initial cell formed when a sperm cell fertilizes an egg cell, marking the beginning of a human's genetic makeup.
Placenta
An organ that develops in the uterus during pregnancy, providing oxygen and nutrients to the growing fetus while removing waste products from the fetus's blood.
Outer Cells
In developmental biology, refers to the cells on the outer layer of a developing embryo, which contribute to the formation of the placenta and other structures.
Embryo
An early stage of development in multicellular organisms after fertilization and before becoming a fetus, characterized by rapid cell division and differentiation.
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