Water reaches its maximum density at 4 degrees Celsius. The biological importance of this is that
Correct answer: A. lakes freeze from the surface down, insulating the water below
- A. lakes freeze from the surface down, insulating the water below
- B. ice sinks to the bottom of lakes in winter
- C. water boils at a higher temperature than expected
- D. evaporation from the skin removes very little heat
Explanation
Water colder than 4 degrees becomes less dense and stays at the surface, so ice forms on top and acts as an insulating lid while liquid water below shelters fish and other life. If ice were denser than liquid water, lakes would freeze solid from the bottom up.
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About Classification of Biological Molecules
Biological molecules are classified as carbohydrates, lipids, proteins and nucleic acids, with water, minerals and vitamins also supporting cellular processes. The key distinctions involve their monomers, chemical bonds, structures and functions, including glucose and starch, fatty acids and triglycerides, amino acids and polypeptides, and nucleotides in DNA and RNA.
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