Step-by-step explanation:
An animal that eats other animals for his own survival is known as a predator. On the other hand, a prey is an animal that is sought and eaten by a predator.
Basically, prey is killed by the predator. A predator is not necessarily an animal as it can be a human being who has hunted and killed an animal.
For example, a man hunted a deer and cooks it near the forest to spend a good evening.
So, here man is the predator and deer is the prey.
Hence, when there is increase in the number of predators in the environment then there will be decrease in the number of prey organisms.