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BIO NMDCAT Biological Importance of Water
nmdcat.online June 27, 2026

The finding that water has a maximum density at 4°C, not at its freezing point, explains the survival of aquatic life in deep lakes during winter because

A. The lake freezes from the bottom up, providing a solid habitat
B. The densest water at 4°C sinks, creating a circulating current that prevents freezing
C. The water at the bottom of the lake remains at 4°C, providing a stable, liquid environment
✓
D. Ice at the surface dissolves oxygen at a higher rate, enriching the lake

📝 Explanation

As surface water cools to 4°C, it sinks, displacing warmer water until the entire lake is near 4°C. Further surface cooling creates less dense, near-freezing water that stays on top and forms ice. This insulates the dense, liquid 4°C water layer at the bottom, allowing aquatic life to survive.

📖 Additional Information

  • The lake freezes from the bottom up, providing a solid habitat
  • The densest water at 4°C sinks, creating a circulating current that prevents freezing
  • The water at the bottom of the lake remains at 4°C, providing a stable, liquid environment
  • Ice at the surface dissolves oxygen at a higher rate, enriching the lake

As surface water cools to 4°C, it sinks, displacing warmer water until the entire lake is near 4°C. Further surface cooling creates less dense, near-freezing water that stays on top and forms ice. This insulates the dense, liquid 4°C water layer at the bottom, allowing aquatic life to survive.

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