A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of the water cycle. It uses the rule of Topic Sentence because it starts with a general statement about evaporation. It does not refer to any previous information, making it independent. Why other lines are not chosen? Paragraph 2 starts with 'This water vapor,' which uses a pronoun and needs context. Paragraph 3 starts with 'When these clouds,' which also uses a pronoun. Paragraph 4 starts with 'This cycle,' which refers back to the water cycle and is not independent.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the main ideas. It uses Conclusive Words like 'but' to show a problem with the water cycle. It summarizes the importance of the cycle and its disruption.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it continues the idea of the water cycle. It uses the Logical Order rule, as it shows what happens after evaporation.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it explains what happens to the clouds. It follows the Broader to Specific Strategy, as it gives more detail about the clouds after they form.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it talks about the importance of the water cycle. It uses the Cause and Effect Relationship rule, as it shows how the cycle is affected by climate change.