A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic about pandas. It does not need another sentence for context. It gives a broad overview of the situation. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. - Paragraph 2 starts with 'Now,' which is a conjunction. - Paragraph 3 starts with 'Then,' which is also a conjunction. - Paragraph 4 starts with 'This,' which is a pronoun that refers back to something else.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the information. It shows a conclusion about the findings related to pandas and their habitats.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): This pair connects because the second sentence shows a new action that people can take after learning about pandas. It follows a logical order of thought.
• Pair 2 (Paragraph 2 → Paragraph 3): This pair connects because the second sentence explains what the GPS does. It gives more specific information about the GPS mentioned in the first sentence.
• Pair 3 (Paragraph 3 → Paragraph 4): This pair connects because the last sentence shows a result of using the GPS. It explains what can be discovered with the data from the GPS.