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Explanation:

Before we decide which sentence can start the series, we can discern two sequences – 5, 3 and 4,2. Sentence 3 follows sentence 5 as sentence 3 elaborates on how lightning, which may be considered an ill wind, blows goodness, because it starts the series of chemical reactions that ultimately help it to nourish the earth.
Similarly, sentence 2 can be deduced to follow sentence 4. Sentence 4 talks about nitrogen floating over earth and sentence 2 refers to its aerial form.
Between the 2 sequences of 5, 3 and 4, 2, one can see that 4,2 would follow 5,3 instead of the other way round as sentence 4 logically follows from sentence 3. Sentence 3 introduces nitrogen and sentence 4 elaborates on it. Also, the remaining sentence 1, coherently follows after sentence 2. This makes the sequence 5, 3, 4, 2, 1.
Hence, the correct answer is 53421.

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