Roots or plant growth making cracks in concrete is it mechanical or
chemical

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.

this protocol describes a detailed procedure for intracellular flow cytometry staining.

b is the answer and if you need further with anything message me