A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main idea. It talks about the Innateness Hypothesis and how to disprove it. This is a general statement that sets up the topic without needing other sentences for context. It does not use any pronouns or definite articles that refer to previous ideas. Why other lines are not chosen? The other paragraphs are not chosen because they do not stand alone. For example, Paragraph 2 starts with "A logical candidate" which needs context. Paragraph 3 starts with "Chimpanzees cannot speak" which assumes prior knowledge. Paragraph 4 uses "It does not follow" which also needs context. Paragraph 5 starts with "Perhaps they can acquire grammar" which is not a clear introduction.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the discussion. It suggests a solution to the problem of chimpanzees not being able to speak. It gives a final thought about using sign language, which reflects the main theme of the text.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it gives an example of a species mentioned in Paragraph 1. This is a logical order where the general idea of the Innateness Hypothesis is followed by a specific example, which is the chimpanzee.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it explains why chimpanzees, as mentioned in Paragraph 2, cannot speak. This shows a cause and effect relationship where the specific example leads to an explanation of its limitations.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it discusses the idea that just because chimpanzees cannot speak, it does not mean they cannot use language. This shows a contrast between the inability to speak and the ability to have language.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects to Paragraph 4 because it suggests an alternative way for chimpanzees to use language. This shows a logical order where the discussion of language leads to the idea of using sign language.