So here we have an example problem that asks, a population will grow exponentially under which of the following conditions? And we've got these four potential answer options down below, where option a says unlimited food, b says unlimited space, c says no competition from other species, and d says no density dependent factors. And so what we need to recall from our previous lesson videos is that the availability of food, space, and the presence and amount of competition are all examples of density dependent factors, and so option d somewhat encompasses options a, b, and c. And recall from previous lesson videos that density dependent factors are factors that limit a population's growth and whose impact on that limitation depends directly on the density of the population. And, usually, it's the case where the greater the density of the population and the closer the population size is to its carrying capacity, the greater the impact that these density dependent factors have on limiting that population's growth.
And also recall from previous lesson videos that populations that grow exponentially will grow uninhibited, and, therefore, they are not limited, and they will not be limited by density dependent factors. And so what we're saying here is that answer option d is the best choice because there are no density dependent factors that are going to have a significant limitation on populations that are growing exponentially. And so d here is the best option for this example problem. That concludes this example, and I'll see you all in our next video.