What is the difference in meaning between "yo conocí" and "yo conocía"?

Read the sentences and choose the correct categories of the verb ser used in the sentences. marta es mi mamá y es paciente. date and personality characteristics relationship and time origin and date relationship, personality characteristics

Mi libro favorito es paula de isabel allende. hace un año. a. la leí b. las leímos c. lo leí d. los leo

Uruguayan atilio pelossi is famous for