A document that gives us first-hand historical informationis a primary source. In historical research and analysis, primary sources are original materials or documents that were created or produced during the time period under study.
These sources provide direct or firsthand evidence about historical events, people, and conditions. Examples of primary sources include diaries, letters, official documents, speeches, photographs, artifacts, and eyewitness accounts. Researchers often rely on primary sources to gain a more accurate and authentic understanding of past events and contexts.
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Answer: Shading techniques that also introduce texture to the drawing. Take drawing a realistic face for instance if u don't shade it wont look you know,...realistic so lets just say realism and texture makes it have its importance.