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 climate change and wildfires, which sets the stage for the rest of the information. It does not refer to anything before it, so it is independent. This follows the rule of Topic Sentence. Why other lines are not chosen? Paragraph 2 starts with "It" which is a pronoun and needs context. Paragraph 3 starts with "The" which refers to something specific and assumes prior knowledge. Paragraph 4 starts with "Wildfires" but does not introduce the main topic of valley fever.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the information. It shows the final effect of wildfires on people, which is the main point of the text. This follows the Summary Style rule.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it explains what valley fever does. This follows the Broader to Specific Strategy. The first paragraph introduces the infection, and the second gives details about its effects.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it explains where the fungi that cause valley fever are found. This follows the Logical Order rule. The second paragraph talks about the effects, and the third gives information about the source.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it explains what happens to the fungi during wildfires. This follows the Cause and Effect Relationship rule. The third paragraph talks about the fungi, and the fourth explains how they can affect people.