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Let X Be the Number of Reptiles, Y Be the Number

Question 79

Multiple Choice

Let x be the number of reptiles, y be the number of mammals, and z be the number of plants on the island of Komodo, all measured in thousands (e.g., x = 50 means 50,000 reptiles) .The following differential equations give the rates of growth of reptiles, mammals, and plants on the island: dxdt=0.2x0.04xy+0.0008xzdydt=0.1y+0.01xydzdt=2z0.002z20.1xz\begin{array}{l}\frac{d x}{d t}=-0.2 x-0.04 x y+0.0008 x z \\\frac{d y}{d t}=-0.1 y+0.01 x y \\\frac{d z}{d t}=2 z-0.002 z^{2}-0.1 x z\end{array} What would happen to the plants if the other two were not present?


A) They would experience logistic growth.
B) They would experience exponential decay.
C) They would remain constant.

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