A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic of organic farming. It gives a broad overview of the importance of organic farming in the food market. It does not refer to any previous information, making it independent. Why other lines are not chosen? Paragraph 2 starts with "In the late 1900s," which needs context. Paragraph 3 starts with "It was a time," which also needs context. Paragraph 4 starts with "Whether these systems," which refers back to previous ideas. Paragraph 5 starts with "As a result," which shows it is connected to something before.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the discussion. It shows the conclusion that people think a re-assessment is needed based on the earlier points. It summarizes the main idea of questioning the current standards.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it shows how organic farming has influenced food manufacturers. This is a logical order because it goes from a general statement about organic farming to a specific example of its impact.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 follows Paragraph 2 because it explains what food manufacturers had to do in response to the challenges from the organic community. This shows a logical order of cause and effect.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it questions if the improvements made by managers have been kept. This shows a logical order of questioning the effectiveness of the changes.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 follows Paragraph 4 because it shows the result of questioning the maintenance of systems. It logically connects by suggesting that a re-assessment is needed due to the concerns raised.