A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic. It gives a clear overview of the situation. It does not use any words that need prior context. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with 'Every day,' which needs context. Paragraph 3 starts with 'Yet,' which shows a connection to something before it. Paragraph 4 uses 'Studies of this man,' which refers back to the engineer. Paragraph 5 starts with 'It offered proof,' which also needs earlier information.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it concludes the discussion. It summarizes the main point and shows the importance of the findings. It uses conclusive words like 'offered proof' to show that it wraps up the ideas.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it continues the story of the engineer. It shows the effects of the brain disease. This is a logical order because it explains what happened to him after he lost his memory.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it shows a different action of the engineer. It explains that even without memory, he still went to the kitchen when hungry. This shows a cause and effect relationship.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it explains why the engineer could go to the kitchen. It shows the scientific findings about habits and memory. This is a broader to specific strategy.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects to Paragraph 4 because it summarizes the importance of the study. It shows that the findings support earlier ideas by William James. This is a logical order because it wraps up the discussion.