Answer:The heliocentric model that involved the radical displacement of the earth to an orbit around the sun (as opposed to being seen as the center of the universe). Copernicus' 1543 work on the heliocentric model of the solar system tried to demonstrate that the sun was the center of the universe.
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The answer is:<span>In English grammar, an imperative sentence is a type of sentence that gives advice or instructions or that expresses a request or command. (Compare with sentencesthat make a statement, ask a question, or express an exclamation.) ... An imperative sentence ends with a period or an exclamation point. so A</span>
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The Adams–Onís Treaty (Spanish: Tratado de Adams-Onís) of 1819, also known as the Transcontinental Treaty, the Florida Purchase Treaty, or the Florida Treaty, was a treaty between the United States and Spain in 1819 that ceded Florida to the U.S. and defined the boundary between the U.S. and New Spain.
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