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Greenleafable
Themes often explore the ideas that were common for a historical period. As periods change so do the themes that writers or artists use. If you examine the themes, you can examine how the intellectual and cultural background of the pieces of art changed over time.
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Answer:

A period only covers a certain time frame, while a theme repeats throughout history.

Explanation:

A theme is something you can look at for anything, not for one specific thing like a period of time. Hope this helps!