Which term describes items that have not been altered from their original state?

The term that describes items that have not been altered from their original state is "primary sources." Primary sources are firsthand accounts or direct evidence that provide original data or information. These can include documents, diaries, photographs, original research, and artifacts that have not been modified or interpreted by others. Because they represent direct evidence from the time period being studied, they are invaluable for research and analysis in various fields, including history, science, and the arts.

In contrast, secondary sources analyze, interpret, or summarize primary sources, while tertiary sources compile and provide a summary of both. Documented sources typically refer to materials that have been formally recorded or published but do not specifically indicate whether or not they have been altered or interpreted. Therefore, primary sources are the most accurate representation of original items or information.