Why do plants animals and people need water to survive?

Plants, animals, and people need water to survive because it is essential for numerous biological processes. Water serves as a solvent for transporting nutrients, regulates temperature, and facilitates metabolic reactions. In plants, it is crucial for photosynthesis and maintaining turgor pressure, while in animals and humans, it aids digestion, circulation, and cellular function. Without adequate water, life processes would be disrupted, leading to dehydration and ultimately death.