organ system - A group of organs working together to perform a certain task, cellular respiration - A process where nutrients are combined with oxygen to produce energy, organ - A collection of tissues that perform a common function, homeostasis - The Ability to maintain a stable internal environment even when the outside environment changes., external stimulus - Something outside an organism in the environment that causes the organism to respond, function - The job, purpose, or responsibility that a person or thing performs or delivers, structure - The shape, physical characteristics, or appearance of an object or thing, internal stimulus - Something inside or within an organism that causes the organism to respond, tissue - A group of cells that work together to perform a special function,

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