Genetics and Evolution Final AThe number of griffs depends on time. The symbol Nt will represent the number of griffs present at the current moment. The symbol Nt 1 will represent the number of griffs we should expect to exist a year from now. How much will the population change between now and next year? The answer depends on the number of individuals added as births (B) and the number of individuals subtracted as deaths (D): Nt 1 = Nt B - D, where B and D are the birth rate and death rate, respectively. Because the units of B and D are individuals per unit of time, we can add the births and subtract the deaths from the size of the population at the current time (Nt) to obtain the size of the population at a future time (Nt 1). To focus on the change in the population size (Nt 1 - Nt), we can rearrange this equation by subtracting Nt from both sides: Nt 1 - Nt = Nt B - D - Nt,ssignment