I know this might be a biology question. But I think this requires the problem solving minds of people in physics. The population of the wolves influences the change in population of the mooses. When the population of the wolves increase, the mooses' population also increase. From the population growth formula of the wolves delta N/delta t = rN(K-N)/K which factor affects the population of the mooses? a)r b)N c)K d) rN e)delta t I picked d) because N represents the initial population, which doesn't affect the population of the mooses if it doesn't change. r is the rate of change in populations, which can affect it i guess but rN denotes the actual change in population. K is the carrying capacity of the population of the wolves. It can affect the population of the mooses, but it does not directly affect it( it will result in the change in population of wolves and then change in mooses) So i think the best answer is d).... What do you people think? please give an explanation for your answer. Thanks!