First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of the text. It gives a broad overview of the research about tree species. It does not refer to any previous information. Why other lines are not chosen? Paragraph 2 starts with "The BCGI" which is a specific reference and does not stand alone. Paragraph 3 starts with "The researchers" which also refers to specific people. Paragraph 4 starts with "The data" which assumes prior knowledge. Paragraph 5 starts with "All the data" which also assumes prior context.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the main idea of the text. It summarizes the information and shows the result of the research. It provides closure to the topic discussed.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 follows Paragraph 1 because it provides more detail about the source of the information mentioned in Paragraph 1. This shows a logical order from a general statement to a specific organization that helps compile the data.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it explains how the BCGI gathered its information. This shows a logical order where the specific actions of the researchers follow the mention of the organization.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 follows Paragraph 3 because it talks about what will happen to the data collected by the researchers. This shows a cause and effect relationship where the collection of data leads to the need for updates.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects with Paragraph 4 because it concludes the discussion by stating that all the data is now in one place. This shows a logical order from the need for updates to the final result of having a complete database.