A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first because it introduces the process of making scrambled eggs. It gives a clear starting point without needing any other information. It does not use any pronouns or definite articles that would need prior context. Why other lines are not chosen? Paragraph 2 starts with "The secret" which refers to something already mentioned, so it is not independent. Paragraph 3 starts with "As they begin" which needs context about the eggs, so it is not independent. Paragraph 4 starts with "Once the eggs appear" which also needs prior information about the eggs, so it is not independent.

Concluding sentence: Why this is the last line? This paragraph is the last because it wraps up the cooking process. It gives the final step and shows what to do when the eggs are ready. It summarizes the cooking method and concludes the topic.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it continues the topic of making scrambled eggs. It explains an important part of the process after whisking the eggs. This shows a logical order of steps in cooking.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 follows Paragraph 2 because it describes what to do after adding milk and cooking the eggs. It shows the next step in the cooking process, which is logical.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it explains what to do after folding the eggs. It describes the final step of cooking, showing a clear progression in the cooking process.