The accompanying graphs. The graphs in part (a) show the numbers of rabbits and foxes in a small arctic population. They are plotted as functions of time for 200 days. The number of rabbits increases at first, as the rabbits reproduce. But the foxes prey on rabbits and, as the number of foxes increases, the rabbit population levels off and then drops. Part (b) shows the graph of the derivative of the rabbit population, made by plotting slopes.

In what units should the slopes of the rabbit and fox population curves be measured?

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2000 1000 0 (20, 1700) Number of foxes -------- Number of rabbits 50 T 1 Initial no. rabbits = 1000 Initial no. foxes = 40 T H 1 11 100 Time (days) (a) 150 200