Use the database table below to answer the following questions. 
-What is primary key integrity? What happens when a database does not have or enforce primary key integrity?
Definitions:
Vascular Tissue System
The tissues specialized for translocation of materials throughout the plant body (i.e., the xylem and phloem).
Dermal Tissue System
The tissue that forms the outer covering over a plant; the epidermis or periderm.
Sclerenchyma Tissue
A type of plant tissue characterized by thick, lignified cell walls that provides support and strength to the plant structure.
Parenchyma Tissue
A type of plant tissue comprising living cells that are often soft and flexible, and primarily involved in photosynthesis, storage, and transport.
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