State one of the most important ways in which ecologic studies differ from other observational study designs used in epidemiology. what is meant by the ecologic fallacy? using your own ideas suggest a possible design for an ecologic study; how might the study design be affected by the ecologic fallacy?

scientists have discovered that hiv does not cause aids by the virus's direct effect on the host's immune cells, but rather through the cells' lethal influence on one another. researchers from the gladstone institutes have revealed that hiv does not cause aids by the virus's

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

the offspring would all be white. if the parents are both white flowers then they have the genotype rr, which when crossed results in an all white punnet square.