Only need help on part B !

(Predator-Prey Models) The classical version of the Lotka-Volterra predator-prey system is as follows: dtdN=N(abP)dtdP=P(cNd) Here, N(t) is the prey population and P(t) is the predator population at time t, and a,b,c and d are positive constants. (a) Briefly explain the ecological assumptions in the model, i.e. interpret each term in the equations. (b) Find a rescaling of variables that makes the model have the following form, with just one parameter: dtdNdtdP=N(1P)=P(N1)