For the most part, why do seeds need soil on top in order to grow?
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They dont have to be covered in dirt but a seed just sitting there under an open sky got way bigger chance of beeing eaten by a bird or blown away by the wind. Thus when we humans plant a seed we just burry them for some protection. There is an issue however in arid, dry or very hot climates where putting seeds deep into the ground will keep it from beeing cooked under the sun before it can sprout.
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