Final answer:
In a predator-prey relationship, the predator population controls the prey population through hunting and consumption. As prey population increases, so does the predator population. However, as the number of predators increases, the prey population decreases, which in turn causes the predator population to decline as well.
Step-by-step explanation:
In a predator-prey relationship, the predator population controls the prey population by hunting and consuming the prey. As the prey population increases, there is more food available for predators, causing the predator population to increase as well. However, as the number of predators increases, they capture more prey, leading to a decrease in the prey population. This decline in prey availability then causes the predator population to decline as well.