Answer:
D.The two species have a prey-predator relationship.
Step-by-step explanation:
The prey-predator ralationship happens when a species feed on another, so when the prey is thriving the predators start to grow in population since they have lots of food available, then when the predator is over populated and it does not have enough food available, it starts to lower in population and then the prey starts to grow in population again, it´s a non-ending circle.