A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic. It tells us about a man and his brain disease. It does not need other sentences to understand it. It is a general statement that sets the stage for the rest of the text. Why other lines are not choosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with 'Every day,' which needs more context. Paragraph 3 starts with 'Yet,' which shows a contrast and needs a previous idea. Paragraph 4 starts with 'Studies,' which refers back to the man in Paragraph 1. Paragraph 5 uses 'It,' which needs a subject from earlier.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it concludes the text. It summarizes the main idea and shows the importance of the findings. It wraps up the discussion about the man's habits and memory.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it continues the story of the man. It shows the effects of his memory loss. This is a logical order because we first learn about the disease and then about his daily struggles.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it shows a different side of the man's behavior. It uses 'Yet' to show contrast. Even though he forgets where the kitchen is, he still goes there when he is hungry.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it explains why the man can go to the kitchen. It shows a breakthrough in science about habits and memory. This is a logical order because it explains the behavior we just read about.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects with Paragraph 4 because it summarizes the importance of the breakthrough. It shows that the findings support earlier ideas from William James. This is a logical order because it wraps up the discussion about habits and memory.