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1. in the entity-relationship model, relationships can have attributes. t/f

2. attributes are the smallest division of data in er diagram. t/f

3.which level of abstraction is the er model most concerned with? a. external, b. conceptual, c. physical, d. internal

4. consider the following relationship involving two entities, students and classes: a student can take many classes. a class can be taken by many students.

how many tables can be used to represent this relationship in a schema? a. 1 b. 2 c. 3. d all of them

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