Here are the answers to your questions:
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The ratio of people with Mayan heredity in Guatemala is 2/3.
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The number of Mayan dialects currently spoken in Guatemala is 23.
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The impressive architecture that the Mayans built includes pyramids.
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According to the video, the reason for the fall of the Mayan empire is often attributed to drought (though there are also other factors like disease and social instability).
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The statement "Many people in Guatemala continue to speak their native Mayan dialects" is True.