First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic of the text, which is the communication skills of African elephants. It is a general statement that does not need any other sentence for context. It does not start with a conjunction or use pronouns. Why other lines are not chosen? Paragraph 2 starts with 'They', which is a pronoun and needs context. Paragraph 3 starts with 'Intriguingly', which is a transitional word. Paragraph 4 starts with 'Although', which is also a conjunction. Paragraph 5 starts with 'Consequently', which is a transitional word. All these reasons make them not independent.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the text by suggesting what should be done about the issues discussed. It uses the word 'Consequently', which signals a conclusion and shows the importance of the topic.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it gives more details about how elephants communicate. This is a Broader to Specific Strategy, where the first sentence gives a general idea and the second sentence provides specific examples.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it adds another way elephants communicate. This follows the Logical Order, as it continues the topic of communication methods.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it talks about the impact of human activities on the communication methods of elephants. This shows a Cause and Effect Relationship, where the first sentence explains how elephants communicate and the second explains the problem they face.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects with Paragraph 4 because it suggests a solution to the problem mentioned in Paragraph 4. This follows the Logical Order, as it moves from the problem to the solution.