The data on this sales invoice would be generated from how many well-structured tables in a well-designed relational database? 
Definitions:
Twin Studies
Research methods used to assess genetic and environmental influences on behaviors by comparing the similarities between identical and fraternal twins.
Family Studies
An academic field that explores the dynamics, structures, and functions of families and relationships.
Adoption
The legal process by which a child's guardianship is transferred from their biological or previous legal guardians to new legal parents.
Genetics
The science of genes, heredity, and the variation of organisms, which explains how traits are passed from parents to offspring.
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