Organism a and b start out with the same population size. organism a's population doubles everyday. after 5 days, the population stops growing, a virus cuts it in half for 3 days. organism b's population grows at the same rate but is not infected with the virus. after 8 days, how much larger is organism b's population than organism a's population. by what factor does organism a's population grow in the first 5 days? express your answer as an exponential expression