A rodent population can be divided into juveniles, subadults and adults. Adults produce, on average, 2.43 juveniles each year. Approximately 25% of juveniles mature each year to become subadults and 10% die (the rest remain as juveniles). Three-quarters of subadults become adults in the next year, and the rest die. Approximately 80% of the adult population survives from one year to the next. (a) Use a directed graph to represent the compartment model. (b) Use a matrix to represent the compartment model