A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of gardening. It gives a broad overview of what the writer did first. It does not refer to any previous information. Why other lines are not chosen? Paragraph 2 starts with "The next step" which needs context from the first paragraph. Paragraph 3 starts with "Once the plants were selected" which also needs prior information. Paragraph 4 starts with "To maintain the garden" which assumes knowledge of previous actions.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the process of gardening. It shows the final steps needed to keep the garden healthy.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it follows the logical order of actions in gardening. After learning the basics, the next step is to choose plants.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 follows Paragraph 2 logically because it describes what happens after selecting the plants. It shows the process of preparing the garden.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it explains what happens after planting the garden. It talks about maintaining the garden, which is the next step.