Each (female) adult of a particular species of stick insect lays 180 eggs at the start of each month?

.......... (in this species there are no males). Suppose that of the eggs survive to the larva stage, of the larvae survive to be pupae and of the pupae grow into adults. Assume that each stage lasts a month and also that of this month's adults survive into next month. Write down the transition matrix M in the matrix model of the population Xn+1 = M Xn where the subscripts n and n+1 refer to successive months and Xn = (En, Ln, Pn, An)T (En = no of eggs, Ln = no of larvae, Pn = no of pupae, An = no of female adults).