A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of food waste. It gives a broad overview of the issue and its impacts. This follows the rule of Topic Sentence. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with "Moreover," which is a conjunction. This means it needs more context. Paragraph 3 starts with "In response," which also needs prior information. Paragraph 4 does not introduce a new topic but builds on the idea of food waste. Therefore, they do not qualify as the first sentence.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion. It shows the importance of the topic and gives a final thought on food waste. This follows the Conclusive Words rule.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it adds more information about food waste. The word "Moreover" shows that it is giving extra details. This follows the Connector Strategy.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it talks about actions taken to solve the problem of food waste. The phrase "In response" shows that it is about what is being done after learning about the issue. This follows the Logical Order rule.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it explains why reducing food waste is important. The word "Consequently" shows that it is a result of the efforts mentioned in Paragraph 3. This follows the Cause and Effect Relationship rule.