What is required for artificial selection

If there is additive genetic variance for the selected trait, it will respond to the selection, that is, the trait will evolve.

depends where

on my head

yes

on my legs

yes

on my

arms

yesh

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.