First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of the moon's movement and its effect on ocean water. It sets up the theme without going into details, which follows the rule of Topic Sentence. Why other lines are not chosen? Paragraph 2 starts with 'When', which is a conjunction, so it cannot be independent. Paragraph 3 starts with 'The moon', but it refers back to the moon without introducing it first, so it is not independent. Paragraph 4 starts with 'In between', which also shows a connection to previous information, making it not independent.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it summarizes the information about tides. It brings together the ideas of high and low tides, which follows the Summary Style rule.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it explains what happens when the moon is in a specific position. This follows the Logical Order rule, as it continues the idea of the moon's effect on tides.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 links to Paragraph 2 because it adds more information about high tides. It shows a Cause and Effect Relationship, explaining another way the moon causes high tides.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it describes what happens between the high tides. This follows the Broader to Specific Strategy, as it gives more detail about the tides.