C. All humans depend on water for maintenance of their internal homeostasis. D. Humans use water to grow crops to use for food and other products.
All of them are correct, reasons why, without it we would die of dehydration, the longest we can live w/out water is up to 6 days.
All options A, B, C, and D correctly describe reasons why it is important for humans to protect and maintain water resources, as water is essential for livestock, power generation, bodily functions, and crop production.
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