An organism is a living thing. Organisms share many common features with each other.
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Organisms respond to the environment around them
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Organisms maintain homeostasis meaning they maintain their internal environment
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Organisms use energy to survive which is made by either photosynthesis or cellular respiration
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Organisms have DNA which is genetic information
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Organisms have the ability to grow, develop and reproduce
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Organisms organize their cells into specific levels and cells have specialized functions. Cells are the basic units of ALL living things.
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Organisms are made up of similar substances such as water, carbohydrates, proteins, lipids and nucleic acids.
Source: prentice hall science explorer 2007 Life Science