First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of maps. It gives a broad overview of what maps can do without going into details. It does not use any pronouns or definite articles that refer to previous information. Why other lines are not choosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with 'They', which is a pronoun, so it needs more context. Paragraph 3 starts with 'But', which is a conjunction, so it cannot be first. Paragraph 4 also starts with 'You', which is a pronoun. Paragraph 5 starts with 'Because', which is a conjunction.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the discussion about maps. It gives the final reason for the drawback mentioned before. It clearly concludes the topic.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it continues the idea about maps. The phrase 'They can depict' refers back to 'Maps', showing a clear link. This is an example of the Noun Pronoun Rule.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it introduces a contrast. The word 'But' shows that there is a problem with what was just said about maps. This is an example of the Contrast rule.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it explains the drawback mentioned. It gives a specific reason for the problem with maps. This is an example of the Broader to Specific Strategy.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects to Paragraph 4 because it gives the reason for the problem. The word 'Because' shows that it explains why you cannot replicate a three-dimensional object on paper. This is an example of the Cause and Effect Relationship.