A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first because it introduces the main topic of the text, which is about a coral. It does not need any other sentence for context. It is a general statement about the coral's size. Why other lines are not chosen? Paragraph 2 starts with 'Found' which is a pronoun and needs context. Paragraph 3 starts with 'In addition' which is a conjunction. Paragraph 4 starts with 'Based on' which is also a conjunction. Paragraph 5 starts with 'It' which is a pronoun and needs context.

Concluding sentence: Why this is the last line? This paragraph is the last because it wraps up the information about Muga Dhambi. It gives a final thought about its history and survival, which concludes the text.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it gives more specific information about the coral mentioned in Paragraph 1. This follows the Broader to Specific Strategy.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it adds more details about Muga Dhambi's height after discussing its width. This shows a Logical Order of ideas.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it explains the age of Muga Dhambi based on its height. This follows the Cause and Effect Relationship.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects to Paragraph 4 because it gives historical context about Muga Dhambi, showing its importance over time. This follows the Logical Order of ideas.