The predator-prey relationship establishes a food chain with a producer, consumer and decomposer. A food chain is really an energy chain. Energy from the sun is captured by the producers and passed on to the consumers. Now you think of a food chain and write it for one food which you had for breakfast. This lack of predators alters the life-sustaining food chains.
Scavengers are organisms that feed on refuse.
Give me an example. Predators are organisms that devour other living organisms for life-sustaining food. List five local scavengers. Make a list of ten animals and classify them as prey or predator. List the predators as carnivore, herbivore or omnivore.