The answer is D. they secretly sent supplies to Americans
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Explanation: philippines run a way
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I think your answer is D. Accurate calendar systems.
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Answer:
Examples include interview transcripts, statistical data, and works of art. A primary source gives you direct access to the subject of your research. Secondary sources provide second-hand information and commentary from other researchers. Examples include journal articles, reviews, and academic books
Explanation:
Materials that are NOT primary sources include: Books written after a historical event by someone who was not involved in the event. Books are considered Secondary Sources. ... Statistics compiled about a historical event (for example, a tally of the number of dead in a battle)
