A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic of the fishing industry. It gives a broad overview of the problem of monitoring fishing. It does not use any pronouns or definite articles that would need prior context. Why other lines are not chosen? Paragraph 2 starts with "Much fishing" which is not independent because it uses a specific subject without introducing the topic first. Paragraph 3 starts with "But this week" which is not independent because it uses a conjunction. Paragraph 4 starts with "John Amos" which is not independent because it uses a proper noun that assumes prior knowledge.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the discussion about the maps. It provides a conclusion by showing the importance of the maps and what they represent. It summarizes the main idea of the previous paragraphs.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): The second paragraph connects to the first because it continues the idea of monitoring fishing. It explains how fishing happens without being seen, which relates to the difficulty mentioned in the first paragraph.
• Pair 2 (Paragraph 2 → Paragraph 3): The third paragraph connects to the second because it introduces a solution to the problem of unobserved fishing. The word "But" shows a contrast, indicating that there is new information that helps with the issue.
• Pair 3 (Paragraph 3 → Paragraph 4): The fourth paragraph connects to the third because it gives more details about the maps mentioned. It explains who made the maps and what they show, which is a logical continuation of the topic.