What is predation rate coefficient, Biology

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Consider an ecosystem consisting of a prey and a predator. If H is the density of prey, P is the density of predator, r is the intrinsic rate of prey population enhance and q is the predation rate coefficient, which of the following correctly shows change in prey population density with time?

a. dH/dT = rH + qP

b. dH/dT = rH - qHP

c. dH/dT = qH - rHP

d. dH/dT = qH + rHP

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