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No. Many forms of life occur in caves, deep in the earth, or deep in the ocean, and they do not need sunlight to grow.

It could be argued that many of these life forms depend on food sources that come from the sunlit world - so a fish living on the bottom of the unlit sea is consuming products that either directly fall from the sunlit surface, or are a part of a larger food chain that starts in the sunlight.

However, there are bacteria that live on chemicals that come from the earth (sea-floor vents) that live on the chemicals, and these life forms would not require sunlight.

One might argue however that without the sun's heat, which comes to the Earth as radiation or light, nothing could live, so in some abstract way, nothing alive could live without the sun and its light.

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15y ago

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