One important advantage that primary soruces have over secondary sources is that primary sources offer a firsthand account of an event - b, which isn't the case with secondary sources. Although this leaves primary sources prone to being biased compared to secondary sources.
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Because copper turns that color because of chemical reactions with other elements. When it gets close to other element's it goes under a series of chemical reactions
The 2nd one fill in. Congress declared war on Japan and the United States joined the allies. Hope I helped♡