Examlex
Endorphin is a shortened term for __________.
Zygote
The initial cell formed when a sperm cell fertilizes an egg cell, marking the beginning of embryonic development.
Embryo
An early stage of development in multicellular organisms, in humans referring to the stage after fertilization up to the end of the eighth week of gestation.
Fetus
A developing human from roughly eight weeks after conception until birth.
Blastocyst
A stage of embryonic development in mammals, occurring roughly five days after fertilization, marked by the formation of a fluid-filled cavity and the differentiation of the embryo into two layers.
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