Rotation is the planet spinning a circle, and a revolution is a planet revolving around the sun
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Many people are willing to suffer in order for the greater good. They feel that if their efforts and suffering can improve the lives of countless people, then their suffering was worth it.
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The correct answer is EXTENDED METAPHOR.
Extended metaphor refers to a comparison between two things that are not alike, which continues throughout a series of sentences in a paragraph or in lines of poem. It is also called sustained metaphor and authors usually use it in order to create a clear comparison between two things.
The aging process can correctly be described as inexorable.
