Mark each statement if it describes a change in historical knowledge based on new discoveries. a. historians know more about ancient sumer today than historians did long ago because of archaeological digs over the last two centuries. b. when king tut’s tomb was discovered undisturbed in the 1920s, we gained a greater understanding of the egyptians’ belief in the afterlife. c. with the discovery of pompeii, we learned that life for the upper-class romans offered comforts and pleasures.