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I still wonder how a seed knows how to grow

Is it like a baby/mitosis/dna, why does it grow

I don't know, but germination has probably been studied a lot: <https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7824603/>

Thanks will skim through that

A seed is a small plant plus nutrients, it knows how to grow the same way as a mature plant does.

I mean why... why does the starch part turn into a stem