Hint: According to H.H. Mitchell of the 158th edition of the Journal of Biological Chemistry, the brain and heart are composed of 73% water, while the lungs are composed of 83% water. The skin contains 64% water, muscles and kidneys account for and even bones are also very watery.
Human water body: Although the actual average percentage of water in the human body varies with gender, age and weight, one thing is the same: from birth, more than half of your body weight is made up of water. Although your life will decline over time, it will remain for most or throughout your life.
You will also discover that the percentage of water changes with age, how the body uses all this water, and how to determine the percentage of water in the body. Or in the first few months of life, nearly three-quarters of your body weight is made up of water.
However, this percentage starts to drop before you reach your first birthday. Over the years, the percentage of water has decreased mainly because the older you are, the fatter you have in your body and the less fat-free substances. There is less water in adipose tissue than in lean tissue, so weight and body composition affect the percentage of water in the body.
Thus the correct answer is option ‘D’.
Note: Access to water is vital to life. Population growth requires a lot of water. Large amounts of water contain resources that are vital to human society. Fish and shellfish are important resources for many human civilizations because of their high protein and vitamin content, which is beneficial to human development.