The risk of groundwater contamination increases with ? A- higher permeability
B- lower permeability
C- more clay in the soil

C Option is correct

hope it's helpful to you

I am from India

compost can be added to topsoil as a:

pesticide

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).