Madrid PAU Biology Practice Questions - Madrid PAU Biology Examination - UCM & Public Universities (Biología 2o Bachillerato 2026) Exam

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Which physicochemical property of water allows aquatic organisms to survive under ice-covered lakes during cold winter seasons?

Maximum density of water occurs in the liquid state at 4 °C, causing ice to float and insulate the underlying water High specific heat capacity causes water to freeze from the bottom of the lake upward Low surface tension prevents ice crystals from forming on the surface of the lake High latent heat of vaporization forces liquid water to contract upon freezing

Correct Answer:

Maximum density of water occurs in the liquid state at 4 °C, causing ice to float and insulate the underlying water

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