A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic of meerkats. It gives a broad overview of the subject without going into details. It does not use any words that need prior context. Why other lines are not chosen? Paragraph 2 starts with "The Kalahari Desert meerkats..." which uses "the" and assumes prior knowledge. Paragraph 3 starts with "They are so habituated..." which uses the pronoun "they" and needs context. Paragraph 4 starts with "It is remarkable..." which is more of a conclusion and does not introduce the topic.

Concluding sentence: Why this is the last line? This paragraph is the last line because it summarizes the main points about meerkats. It wraps up the discussion by showing how their behavior is now easy to see. It uses conclusive words like "it is remarkable" to signal the end.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it continues the topic of meerkats. It gives a specific example of the meerkats mentioned in Paragraph 1. This shows a logical order from general information to a specific detail.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it explains how these meerkats behave. It shows a logical order where the specific example of Kalahari meerkats leads to their behavior.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it reflects on the behavior of meerkats. It concludes the discussion by showing how this behavior is now observable by everyone.