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 clearly states the main idea about the demand for beef. This follows the rule of Topic Sentence. It does not refer to any previous information, so it stands alone. Why other lines are not chosen? Paragraph 2 starts with 'This is', which uses a pronoun that refers back to something else. Paragraph 3 starts with 'As a result', which is a conjunction and needs a previous sentence for context. Paragraph 4 starts with 'However', which also needs prior information to make sense.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion by highlighting the concerns related to beef production. It uses the phrase 'raises concerns', which signals a conclusion about the topic. This follows the Conclusive Words rule.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it explains why the demand for beef is increasing. This follows the Broader to Specific Strategy. The first sentence gives a general idea, and the second sentence provides specific reasons.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it shows the result of the reasons given in Paragraph 2. This follows the Cause and Effect Relationship rule. The increase in population and income leads to more beef production.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it discusses the problems that come from the increase in beef production. This follows the Contrast rule. The third paragraph talks about the growth, and the fourth paragraph talks about the issues that arise from that growth.