1 does it make sense to have an entity with one attributes ? … explain in simple words
                

                

                    
                

                

                    2 are relationships between two entites permanent, or can the nature of this relationship change over time ? … explain in simple words                 

                

                    
                

                

                    3 of we have two entites , a PLANE and a POILT, and describe the relationship between the two entities as:
                

                

                    



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