Multiple choice

Organisms living inside a frozen lake survive because

  1. These organisms are cold blooded

  2. Water near the bottom does not freeze

  3. These organisms hibernate in ice

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Organisms survive at the bottom of frozen lakes because water at the bottom remains liquid due to water's unique density properties. Water is densest at 4°C, so the coldest water sinks and freezes at the surface, creating an insulating ice layer while warmer water (around 4°C) stays at the bottom, allowing aquatic life to survive.

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