Consumer - A living thing that cannot make its own food and must eat other living things, Decomposer - Organisms that break drown dead organisms and animal wastes into simpler substances, which are then returned to the environment, Producer - Organisms that creates its own food, Ecosystem - A system in which organisms interact and exchange matter and energy , Community - all the different populations that live together in an area, Population - A group of same organisms that belong to the species and live in the same area, Invasive Species - A nonnative species that is better able to compete for resources than the existing or native species.,

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