Population - Group of organisms of the same species living in the same environment, Community - Group of different populations living in the same environment and interacting with one another, Ecosystem - Made of populations in a community interacting with their physical environment, Mutualism - Relationship in which two organisms support or benefit each other, Parasitism - Relationship in which one organism benefits while causing harm to another organism without killing it, Commensalism - Relationship in which one organism benefits while the other derives neither benefit nor harm, Producer - Organism that makes its own food, Consumer - Organism that feeds on producers or other organisms to obtain energy, Decomposer - Organisms that break down waste products and dead organisms to obtain energy, Food chain - Series of organisms through which energy and nutrients are transferred,

12 Interactions Within Ecosystems

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