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The NOT NULL constraint can only be created at the ____ level.
Intelligence Scores
A numerical representation of an individual's cognitive abilities relative to the population, typically obtained through standardized tests.
Genetic Factors
Elements within an organism's genes that influence its physical traits and behaviors, highlighting the role of heredity in development.
Identical Twins
Twins who have developed from a single fertilized egg and share the same genetic material, making them genetically identical.
Fraternal Twins
Twins that develop from two different eggs fertilized by two different sperm cells, genetically similar like regular siblings rather than identical twins.
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