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Water is a critical component of cells, playing a vital role in various biological processes. The correct answer reflects the fact that, on average, approximately 75% of a cell's mass is composed of water. This high percentage is attributed to water's properties, such as its ability to act as a solvent, its participation in biochemical reactions, and its role in maintaining cell structure and function.
In biological systems, water assists in transporting nutrients, regulating temperature, and facilitating metabolic processes. Different types of cells may contain varying amounts of water based on their functions, but the general estimate remains close to 75%. This aspect underscores the importance of water in cellular physiology and supports its role in sustaining life.