explain the relationship between blood volume and blood pressure to do with the renin angiotensin system

blood volume increases arterial pressure blood pressure fluid Renin by itself does not really affect blood pressure.  Instead, it floats around and converts inactive forms of angiotensin into angiotensin I.

Explanation:

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).