First sentence: Why this is the first line? This paragraph is the first because it introduces the main topic of climate change. It does not need another sentence for context. It is a general statement that sets the stage for the following ideas. Why other lines are not chosen? Paragraph 2 starts with "As a result," which is a conjunction. Paragraph 3 starts with "These extreme events," which refers back to something not yet mentioned. Paragraph 4 starts with "Consequently," which also shows a connection to previous information. All these reasons make them not independent.

Concluding sentence: Why this is the last line? This paragraph is the last because it summarizes the effects of the previous points. It shows the final outcome of the issues discussed earlier.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it uses the connector "As a result." This shows that the extreme weather events are a direct result of climate change.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it explains the effects of the extreme weather events. It shows a logical order where the extreme events lead to problems in agriculture.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it shows the cause and effect relationship. The decrease in agricultural productivity causes food prices to rise.