A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic. It talks about the belief that listening to Mozart can help a child's intelligence. This is a general statement that does not need other sentences for context. It does not use any pronouns or definite articles that refer to previous ideas. Why other lines are not chosen? Paragraph 2 starts with "Nevertheless," which is a conjunction. Paragraph 3 starts with "It was discovered," which needs context from earlier sentences. Paragraph 4 starts with "For example," which also needs a previous idea. Paragraph 5 starts with "However," which is a conjunction too.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the discussion. It shows that despite the belief and actions taken, there is no strong evidence to support the claim. This conclusion reflects the main theme of the text.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it uses the word "Nevertheless." This shows a contrast to the belief mentioned in Paragraph 1. It introduces the idea that there is little scientific proof for the belief.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it continues the discussion about the claim of Mozart's music helping intelligence. It provides an example of a study that supports the claim, showing a logical order from evidence to a specific case.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it gives an example of how the belief in Mozart's music is acted upon. The phrase "For example" shows that it is providing a specific case related to the general idea in Paragraph 3.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects with Paragraph 4 because it introduces a contrast. The word "However" shows that while there are actions taken based on the belief, scientists found no strong evidence to support it.