Answer the following question: Fact 1: Conserving water can be used for survival in a dry environment. Fact 2: Most of the southwest is semi desert and very dry. Given the two facts above, where is conserving water useful for survival?

Pick your answer from: [I] abalone; [II] desert; [III] marshland; [IV] cactuses; [V] earth; [VI] wetlands; [VII] river bank; [VIII] watershed;
Answer:
[II]