A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic of the text. It talks about the study of religion and human beings as spiritual animals. This is a broad overview of the subject. It does not use any words that need prior context. Why other lines are not chosen? Paragraph 2 starts with "But" which is a conjunction, so it cannot be independent. Paragraph 3 starts with "This" which is a pronoun and needs context. Paragraph 4 starts with "But" which is also a conjunction. 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 ideas presented in the text. It summarizes the importance of early faiths in human experience. It gives a final thought on the topic.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it continues the idea of human beings and their spiritual nature. It shows how humans expressed their spirituality by creating religions. This is a logical order of ideas.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it explains why humans created religions. It gives a reason for the actions mentioned in Paragraph 2. This shows a cause and effect relationship.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it adds more information about the early faiths. It shows what these faiths expressed, which is a broader idea that follows the specific reason given in Paragraph 3. This is a logical order.