Physics
Fish and other aquatic creatures can live inside a deep frozen pond because

Ice is a bad conductor of heat
Fish are cold-blooded animals
There will always be water just beneath the ice level
They can adapt themselves to live in ice

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Physics
An egg sinks in soft water but floats in a concentrated solution of salt because

The density of salt solution exceeds the density of eggs
Water has high surface tension
Albumin dissolves in salt solution and egg becomes lighter
Egg absorbs salt from the solution and expands

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