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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 in the intrinsic rate of prey population increases and q is the predation rate coefficient.Which of the following correctly represents change in prey population density with time?

$\begin{array}{1 1}(a)\;\large\frac{dH}{dt}=\normalsize rH+qp\\ (b)\;\large\frac{dH}{dt}=\normalsize rH-qp\\(c)\;\large\frac{dH}{dt}=\normalsize rH-qHp \\(d)\;\large\frac{dH}{dt}=\normalsize qH+rHp\end{array}$

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