Concatenated Keys Are

question 31

Multiple Choice

Concatenated keys are

• A) only needed when combining two or more REA diagrams.
• B) foreign keys used to implement 1:N or 1:1 relationships.
• C) multiple attribute keys used to implement 1:N relationships.
• D) required to implement M:N relationships.

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Definitions:

Exercise

Physical activity that is planned, structured, and repetitive for the purpose of conditioning any part of the body, improving health, and maintaining fitness.

Alveolus

A small air sac within the lungs where the exchange of oxygen and carbon dioxide takes place during respiration.

Pulmonary Capillary

A small, thin-walled blood vessel located in the lungs where gas exchange between the blood and alveoli occurs.

Oxygen Diffusion

The movement of oxygen molecules from areas of high concentration to areas of low concentration, essential for respiratory processes in cells.