A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic about ants and rain. It does not need another sentence to understand it. It is a general statement that sets the stage for the rest of the text. Why other lines are not chosen? Paragraph 2 starts with "But" which is a conjunction, so it cannot be first. Paragraph 3 starts with "Some people say" which needs context, so it is not independent. Paragraph 4 starts with "The short answer is" which also needs context from previous sentences.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it gives a final answer to the question. It wraps up the discussion about ants and rain. It summarizes the main point and gives extra information about ants.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it gives an example of what people say about ants. This shows a logical order from a general statement to a specific example.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it asks a question about the example given. This shows a logical order where the example leads to a question about its truth.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it answers the question asked in Paragraph 3. This shows a logical order where a question is followed by an answer.