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16. An entity class is a collection of entities and is described by the structure of the entities in that class.

A. True
B. False

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17. Relationship classes are associations between entity classes.

A. True
B. False

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18. An identifier typically uses more than one attribute.

A. True
B. False

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19. An identifier determines the type of relationship that an entity has.

A. True
B. False

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20. A recursive relationship is a relationship between an archetype and an instance of that archetype.

A. True
B. False

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