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According to Journal of Biological Chemistry 158, human brain and heart are composed of ________water?

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According to Journal of Biological Chemistry 158, human brain and heart are composed of ________water?

A. 75%
B. 81%
C. 73%
D. 89%

According to H.H. Mitchell, Journal of Biological Chemistry 158, the brain and heart are composed of 73% water, and the lungs are about 83% water. The skin contains 64% water, muscles and kidneys are 79%, and even the bones are watery: 31%.