How long did this person exercise.. explain your answer​

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).

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves

answer/// to address the needs of adults with mental illness and increase their ability to function;