A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of photography. It gives a broad overview of what is needed to take better photographs. It does not use any pronouns or definite articles that refer to previous information. Why other lines are not chosen? Paragraph 2 starts with 'Experimenting', which is not independent because it refers to actions that follow. Paragraph 3 starts with 'After mastering', which is not independent because it assumes prior knowledge of mastering shots. Paragraph 4 starts with 'Finally', which indicates it is not independent as it suggests a conclusion.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the ideas presented. It uses the word 'Finally', which signals the conclusion. It summarizes the importance of practice and review in mastering photography.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 logically connects with Paragraph 1 because it continues the topic of photography. The word 'follows' shows that it is the next step after understanding the camera settings. This is a clear logical order.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it builds on the idea of improving photography. It shows that after understanding lighting and composition, the next step is to master individual shots. This is a broader to specific strategy.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it concludes the process of learning photography. It shows that after combining techniques, regular practice is needed for improvement. This is a logical order.