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The Value of a Primary Key Must Be Unique for Each

question 4

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The value of a primary key must be unique for each tuple of its table.


Definitions:

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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