If a plant or animal suddenly disappeared, other things that needed it to survive would also die. So plants and animals are important to each other. In order for a plant or animal to live, another plant or animal must die. When something dies it gives life to other things. This circle is called a food chain.
Producers are the plants and animals that make the food.
Consumers are those plants and animals that eat the producer for their food value. Decomposers live on the dead consumers and producers by rotting the hair and meat turning it into soil for the producer to grow in.