Which of the following is a function of water? A. A major component of blood; transports various dissolved substances throughout the body
B. A major component of the hard bony matrix that surrounds bone cells and gives strength to bone
C. A major component of the skull that protects the brain from injury
D. A major component of oily secretions from sebaceous glands that soften the skin and hair
The correct answer is A. A major component of blood; transports various dissolved substances throughout the body.
Explanation: Water is essential for bodily functions as it serves as a significant component of blood, helping transport nutrients, oxygen, hormones, and waste products through the circulatory system. This transport function is crucial for maintaining homeostasis and overall health. Options B, C, and D refer to components like bone matrix, skull composition, and oily secretions, which are not primarily functions of water.