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While not the only mechanism of producers at the bottom of food chains, photosynthesis depends on light to turn inorganic carbon dioxide and water into glucose and therefore all the derivatives such as celulose, etc. Animal life as is would probably not exist if there were no light.

Light radiation can also heat up the planet, infra-red trapped in the atmosphere makes this planet livable.

Humans can only synthesis Vitamin D when exposed to light. It's something that "broke" in our evolutionary history (chimps don't have this problem), making us even more dependant on light.

Many animals rely heavily on sight.

It helps regulate circadian rhythms in most cases. When to go to sleep, wake up, eat, etc.

Some insects such as some moths navigate based on the position of a night light source, the moon.

Essentially, most animals evolved during millions of years in environments that have day and night cycles, and some are more dependant on it than others.

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11y ago

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