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

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

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Physics
Planets do not twinkle because

Their distance from the earth does not change with time
They are nearer to earth and hence we receive a greater amount of light.
They emit light of a constant intensity
They are very far away from the earth resulting in decrease in intensity of light

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