Herbivores eat plants. Carnivores eat other animals. Predators kill and eat their prey. Scavengers feed an dead animals. Omnivore seat both plants and animals.
Saprophytes break down dead plants and animals.
There are three types of symbiotic relationships that you will study in more detail later. Mutualism where both organisms benefit, commensalism where one organism benefits, and parasitism where the host may be killed by the parasite. The producers make their own food. Consumers eat the foods produced and decomposers recycle nutrients back into the ecosystem. In every ecosystem , there is a pathway of energy flow that always begins with the producers.