A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic of moral courage. It does not need another sentence for context. It sets up the idea that there are different impulses for moral courage without going into details. This follows the rule of Topic Sentence. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, 'Compassion is one of these' starts with a pronoun and needs the first sentence for meaning. 'Tentatively it can be suggested...' is not general and needs context. 'It is recognition of compassion's part...' also uses 'it' which refers back to something else.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the discussion about compassion and its effects. It summarizes the main idea and shows the conclusion of the argument.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it uses the connector 'these' to refer back to the impulses mentioned in Paragraph 1. This shows a clear logical order.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 follows Paragraph 2 logically because it explains how compassion is an influence. This shows a broader to specific strategy, where the specific influence of compassion is discussed.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it explains the consequences of recognizing compassion. This shows a cause and effect relationship.