A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of organic farming. It gives a broad overview of the subject without going into details. It does not use any pronouns or definite articles that would need prior context. Why other lines are not chosen? Paragraph 2 starts with "In the late 1900s," which refers to a specific time and is not independent. Paragraph 3 starts with "It was a time," which also refers back to a previous idea. Paragraph 4 starts with "Whether these systems," which is a question and needs context. Paragraph 5 starts with "As a result," which shows it is a continuation of a previous idea.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion. It shows the conclusion that comes from the earlier points about organic farming and the need for reassessment.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it gives an example of how organic farming has influenced food manufacturers. This shows a logical order from a general statement to a specific example.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 follows Paragraph 2 because it explains what managers had to do during that time. This shows a logical order from the challenge to the actions taken by managers.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it questions if the improvements made by managers are still in place. This shows a logical order from actions taken to the current situation.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 follows Paragraph 4 because it gives a conclusion based on the questioning of the systems. This shows a logical order from questioning the current state to suggesting a need for reassessment.