AP English Language

The best concluding sentence is: D.The water cycle is essential for maintaining life on Earth.

Here’s why:

This sentence ties back to the topic sentence, which discusses the continuous movement of water. The concluding sentence emphasizes the importance of the water cycle in supporting life, which complements the idea that the water cycle plays a vital role on Earth.

Why the other options are less suitable:

A."The water cycle is not importa...