Which property of water makes it essential for the human body, which is composed of approximately 60% water?

• A. Its nonpolar nature
• B. Its ability to dissolve a wide variety of substances
• C. Its high melting point
• D. Its inability to form hydrogen bonds

Answer: (B)

Verified step by step guidance

1. Understand the context: The human body is composed of approximately 60% water, and water plays a critical role in various biological processes. The question asks which property of water makes it essential for the human body.
2. Review the properties of water: Water is a polar molecule, meaning it has a partial positive charge on the hydrogen atoms and a partial negative charge on the oxygen atom. This polarity allows water to interact with and dissolve many substances, making it an excellent solvent.
3. Eliminate incorrect options: (1) Water is not nonpolar; it is polar. (2) Water's high melting point is not directly relevant to its role in the human body. (3) Water can form hydrogen bonds, which are crucial for its unique properties.
4. Focus on the correct property: Water's ability to dissolve a wide variety of substances (its role as a 'universal solvent') is essential for transporting nutrients, removing waste, and facilitating chemical reactions in the human body.
5. Conclude: The correct answer is 'Its ability to dissolve a wide variety of substances,' as this property is vital for maintaining homeostasis and supporting life processes in the human body.