According to Teleology, each organism is like a rifle bullet fired straight at a mark; according to , organisms are like grapeshot of which one hits something and the rest fall wide. For the teleologist an organism exists because it was made for the conditions in which it is found; for the an organism exists because, out of many of its kind, it is the only one which has been able to persist in the conditions in which it is found. Teleology implies that the organs of every organism are perfect and cannot be improved; the theory simply affirms that they work well enough to enable the organism to hold its own against such competitors as it has met with, but admits the possibility of indefinite improvement.