Question

why sun vitamin d source important for human life

Answer 1

Vitamin d is important for human life as it is responsible for the absorption of calcium and help in growth of bones . If we don't have vitamin d then bones would become soft and this would cause problems .
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Answer 2

not sun's vitamin D is important but vitamin D in particular is important.

Vitamin D makes the human bones stronger.
it also have other benefit like it reduces health related risk e.g cancer, diabetes etc

As far as sun is concerned it a free source of vitamin D so why not utilise it.

:-)