How many alleles are there for the four main types of human blood?
Please answer fast

it's unlikely a majority of a large population would agree on issues

hope this : )

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).