Why would a turkey evolve to
not fly?

Over time, farmers have bred turkeys to have larger and larger breasts. A turkey breast gets stronger as it gets larger, but the animal's power-to-mass ratio diminishes, so it can't flap quickly enough to support sustained flight.

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.