the absence of frogs, the fly population will grow exponentially and the crocodile population will decay exponentially. In the absence of crocodiles and flies, the frog population will decay exponentially. If P(t), Q(1), and R(t) represent the populations of these three species at time t, write a system of differential equations as a model for their evolution. If the constants in your equation are all positive, explain why you have used plus or minus signs. 4. Flies, frogs, and crocodiles coexist in an environment. To sur- vive, frogs need to eat flies and crocodiles need to eat frogs. In 7.6:4

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