Code up this model so that you can iterate for 50 generations, starting from J(0) = 100 juveniles

and zero young adults or full adults. Assume that both birth rates are 1 juvenile per adult per time,

and that 25% of juveniles and young adults mature per time step, and 50% of adults survive per time

step.1 Make a plot of 50 generations with Juveniles in black, Young adults in red, and Full adults in

orange. Don't forget to label your plot.