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 text. It talks about the environmental impact of meat consumption, which is a broad overview of the subject. It does not use any specific details or references to previous ideas. Why other lines are not chosen? Paragraph 2 starts with "Livestock farming" which is specific and not general. Paragraph 3 starts with "Additionally" which is a conjunction. Paragraph 4 starts with "As a result" which also shows a connection to something before it. All these reasons make them not independent.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion. It shows the conclusion of the ideas presented before it. It explains what many people are doing in response to the environmental issues discussed.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it continues the topic of meat consumption. It gives specific details about livestock farming, which is part of the environmental impact.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it adds more information about meat production. The word "Additionally" shows that it is giving more details related to the previous paragraph.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it shows the result of the issues mentioned in Paragraph 3. The phrase "As a result" indicates that people are changing their diets because of the problems with meat production.