First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of chameleons and their ability to change color. It 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 information. Why other lines are not chosen? Paragraph 2 starts with 'This color change', which uses a pronoun that refers back to the previous sentence. Paragraph 3 starts with 'Contrary to popular belief', which is a phrase that suggests prior context. Paragraph 4 starts with 'However', which is a conjunction and shows a continuation of thought. Paragraph 5 starts with 'Without intervention', which also suggests a condition that needs prior context.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it summarizes the consequences of habitat loss. It brings together the earlier points about threats to chameleons and shows the overall impact on the environment.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it continues the topic of color change. It explains the functions of color change, showing a logical order from a general statement to specific details.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it adds more information about the reasons for color change. It shows a broader to specific strategy, explaining that color change is not just for camouflage.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it introduces a new topic about threats to chameleons. The word 'However' shows a contrast between the information about color change and the new issue of habitat loss.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects with Paragraph 4 because it explains the consequences of habitat loss. It shows a cause and effect relationship, where habitat loss leads to a decline in chameleon populations.