• Biochemistry,  Q & A


    Q1.  What is the approximate percentage (in mass) of water in the human body? Is this percentage expected to be larger in the adult or in the old individual?  Ans: Approximately 65% of the human individual mass is water. The brain, for example, has around 90% of water in mass, the muscles, 85%, and the bones have between 25% and 40% of water. Younger adult individuals have proportionally more water in mass than older individuals. Q2.  What are the main biological functions of water? Ans: Water is the fundamental solvent for chemical reactions of living beings; it is the main means of substance transportation in the cell and between cells…

  • Biology,  environmental science

    The Water Cycle

    Water cycle: a continuous pattern in nature in which water moves as it changes state above, on, and below the surface of Earth.Water is the only substance that exists on Earth in each of its three states. Water easily changes from one state to another. Water sometimes changes its location by changing state in a continuous pattern called the water cycle. The water cycle is self-renewing and constant. The Sun provides the energy to power the water cycle.Changes of StateWhen water changes state in the water cycle, the total number of water particle remains the same. The changes of a state include melting, sublimation, evaporation, freezing, condensation, and deposition. All…


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