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

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

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Physics
Why does the sea appear blue in colour?

Scattering of the sunlight by water molecules
Reflection of the sun light from water surface
Interference of the sun light from water surface
Refraction of the sun light

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