Between whom were the crusades fought? a) The Eastern and Western Roman Empires b) The Romans and Greeks c) The Europeans and the Arabs d) The Barbarians and the Romans
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Air is all around us, but we can’t see it. So what is air, exactly? It’s a mixture of different gases. The air in Earth’s atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.
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d
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