Examlex
Fast moving currents of air found near the top of the troposphere are called ________.
Embryo
An early stage of development in multicellular organisms following fertilization, before developing into a fetus.
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.
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