Final answer:
An increase in predator population and a decrease in food supply can lead to a significant increase in the density of the hare population.
Step-by-step explanation:
In predator-prey dynamics, an increase in the predator population and a decrease in the food supply can lead to a significant increase in the density of the hare population. When there are more predators, they exert more pressure on the hare population, causing them to reproduce more and increase in number. At the same time, a decrease in the food supply can lead to competition among hares, resulting in a higher population density as hares struggle to find enough food.