Water is a limited resource, and we must use it wisely.
Explanation:
In an essay in the conclusion you must restate what your essay is about therefore, Water is a limited resource, and we must use it wisely. is your best choice.
Water is a limited resource, and we must use it wisely.
Explanation:
This is the phrase that is most likely to be used as the conclusion of an essay about water conservation. The conclusion of an essay is supposed to restate the main idea while also giving the reader a sense of closure. In this case, the sentence restates the main idea (water is limited) while also providing a sense of closure to the reader.