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In a line of poetry, an iamb is a foot or beat consisting of an unstressed syllable followed by a stressed syllable, or a short syllable followed by a long syllable. For example, deLIGHT, the SUN, forLORN, one DAY, reLEASE.
Number 2 is correct because this is an appositive sentence structure, which means one sentence is interrupted by another.
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Answer:
Space exploration will lead to increased conflict among nations and should be discouraged.
Explanation: