Examlex
The value of a primary key must be unique for each tuple of its table.
Embryonic Mass
A cell cluster formed in early embryonic development that will differentiate into various tissues and organs as growth progresses.
Blastula
An early stage of embryonic development in animals, characterized by a sphere of cells surrounding a central fluid-filled cavity.
Morula
Mass of 12 or more cells resulting from the early cleavage divisions of the zygote.
Placenta
An organ that develops in the uterus during pregnancy, providing oxygen and nutrients to, and removing waste from, the fetus.
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