This quiz asks you to explain the results from the previous exercise When the evaporation rate was zero, too low we saw that the pheromones paths grew very wide attracting too many ants to one particular food source keeping the ants from exploring other food sources so the answer was b. and when the evaporation rate was 20, too high the paths evaporates too quickly and thus nearby ants were not attracted to the path leaving to a food sources this kind of trade-off between being too ready to exploit the best seeming possibility or being too willing to explore many other possibilities is a classic trade-off for adaptive systems called the exploitation vs. exploration trade-off which we'll talk about in depth later on