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Rearrange the following sentences in the correct order to make a logical passage: 1. Regulatory agencies then conduct independent reviews before granting approval for widespread public use. 2. The development of a vaccine typically begins with extensive laboratory research to identify a suitable antigen. 3. Clinical trials across three phases are subsequently conducted to assess the vaccine’s safety, efficacy, and optimal dosage. 4. Post-approval surveillance continues to monitor for any long-term adverse effects within the broader population.

1. 2 - 1 - 3 - 4
2. 2 - 3 - 1 - 4
3. 3 - 2 - 4 - 1
4. 1 - 2 - 3 - 4

Correct answer: 2 - 3 - 1 - 4

Solution

Sentence 2 introduces the beginning of vaccine development. Sentence 3 follows with clinical trials, sentence 1 comes next with regulatory approval, and sentence 4 logically ends with post-approval surveillance.

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