Final answer:
Water is the most indispensable nutrient as it is crucial for hydration, digestion, and temperature regulation.
Step-by-step explanation:
Water is considered to be the most indispensable nutrient because it plays a crucial role in maintaining the body's functioning.
Firstly, water is essential for hydration and maintaining the body's fluid balance.
Secondly, water helps with digestion by aiding in the breakdown of food and absorption of nutrients.
Lastly, water is involved in temperature regulation as it helps regulate body temperature through the process of sweating.
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